New Gears? - 04 Ram 1500 4x4
From : homebrewer
Q: im still working the problems from my last post reguarding the cruise front end alignment and vibrations. im getting ther but need advice on new gear ratios. i went from stock 245/70 17s to 35x12.5 17s. this threw the computer way off in the truck and the dealer has been trying to aviod helping me out. the cruise issue apparantly cant be fixed with out new gears.they set the cruise to work up to 61 mph. whay this number i have no idea i dont think the know - because no one can explain it to me. anyway i was planning on installing 4.10 gears to help with big tires and towing but now im being told that shorter gears may be better it seems my only options are 4.10 and 4.56 - with aftermarket gears for this truck. whic one will help me most..i pull a 3k # trailer on ocassion and would like to run at 70-75 mph with it. thanks .
Replies:
From : bob
homebrewer wrote im still working the problems from my last post reguarding the cruise front end alignment and vibrations. im getting ther but need advice on new gear ratios. i went from stock 245/70 17s to 35x12.5 17s. this threw the computer way off in the truck and the dealer has been trying to aviod helping me out. the cruise issue apparantly cant be fixed with out new gears.they set the cruise to work up to 61 mph. whay this number i have no idea i dont think the know - because no one can explain it to me. that doesnt make sense. i set mine at 80 mph. i think your dealer is confused. anyway i was planning on installing 4.10 gears to help with big tires and towing but now im being told that shorter gears may be better it seems my only options are 4.10 and 4.56 - with aftermarket gears for this truck. whic one will help me most..i pull a 3k # trailer on ocassion and would like to run at 70-75 mph with it. i would go with 4.56. that should put you into the power band while towing. -- ..bob arrived 2006 fxdi red. 1997 hd fxdwg - turbocharged stolen 11/26/05 in denver 1hd1gel10vy3200010 co license j5822z 2001 dodge dakota qc 5.9/4x4/3.92 1966 mustang coupe - daily driver 1965 ffr cobra - 427w efi damn fast. .
From : snoman
on thu 27 jul 2006 173350 -0600 .bob bobcowan@access4less.nospam.net wrote i would go with 4.56. that should put you into the power band while towing. lets put it this way a 4.56 with 35s is not much better than a 3.73 with 30s and a 4.10 would be equal to about a 3.42 to 3.55 with stock tires. what does this mean you want at least a 4.56 here especailly if you want to tow anything there is more than just effective gear ratio here as extra lift and tire ad more drag too a 4.88 would be better as it would about equal 4.10s with stock tires which is not deep at all though some think it is in a 4x4 truck with od. also 4.88 gears are made for your axles by yukon and you want to use yukon or precision gears here. ----------------- the snoman www.thesnoman.com .
From : homebrewer
ive searched and call about 10 vendors and no one has anything beyond the 4.56 gears. you have a source for 4.88s on thu 27 jul 2006 173350 -0600 .bob bobcowan@access4less.nospam.net wrote i would go with 4.56. that should put you into the power band while towing. lets put it this way a 4.56 with 35s is not much better than a 3.73 with 30s and a 4.10 would be equal to about a 3.42 to 3.55 with stock tires. what does this mean you want at least a 4.56 here especailly if you want to tow anything there is more than just effective gear ratio here as extra lift and tire ad more drag too a 4.88 would be better as it would about equal 4.10s with stock tires which is not deep at all though some think it is in a 4x4 truck with od. also 4.88 gears are made for your axles by yukon and you want to use yukon or precision gears here. ----------------- the snoman www.thesnoman.com .
From : tom lawrence
first a 1500 likely does not have a 9.25 front axle but even if it where did i say front does tom should know the a 9.25 aam front axle made for dodge uses the exact same ring and pinion as the gm 9.25ifs. snoman should know that in the 1500s dodge uses an 8 ifs differential up front which also only shows up to a 4.56 r&p. performance he needs at least a 4.88 becaice of extra drag that most ignore. with 4.56s it will feel like maybe a 3.73 at most performance wise and hurt towing at serious weight. tell ya what genius... why dont you post a source and part numbers for these mythical 4.88 gears you keep speaking of and the rest of us will shut up. .
From : homebrewer
my truck uses the aam 8 ifs and the 9.25 rear. there are no 4.88s that will fit in the front. also i have 3.55 gears now and had 245/70s from the factory. that set up pulled my trailer just fine. i think with the added drag of 35s the 4.56 gears should be the ticket. now i am scared that the dealer cant program my computer to get the cruise and speedo correct after i change the gears. i have been there 3x since adding the tires and the cruise only works up to 61mph and the speedo is off by 4 mph once i get up to about 65. i assume this is due to the tire specs being slightly off and stating they rotate 598 times per mile. first a 1500 likely does not have a 9.25 front axle but even if it where did i say front does tom should know the a 9.25 aam front axle made for dodge uses the exact same ring and pinion as the gm 9.25ifs. snoman should know that in the 1500s dodge uses an 8 ifs differential up front which also only shows up to a 4.56 r&p. performance he needs at least a 4.88 becaice of extra drag that most ignore. with 4.56s it will feel like maybe a 3.73 at most performance wise and hurt towing at serious weight. tell ya what genius... why dont you post a source and part numbers for these mythical 4.88 gears you keep speaking of and the rest of us will shut up. .
From : snoman
on sat 29 jul 2006 201646 gmt tom lawrence tnloaswpraemnmcien5g@earthlink.net wrote first a 1500 likely does not have a 9.25 front axle but even if it where did i say front does tom should know the a 9.25 aam front axle made for dodge uses the exact same ring and pinion as the gm 9.25ifs. snoman should know that in the 1500s dodge uses an 8 ifs differential up front which also only shows up to a 4.56 r&p. guess again clueless. aam does not make a 8.0 ifs axle. they make a 8.25 one that dodge uses too they make a cast iron pig and alum pig version again dribble from you. the blind leading the blind. dodge may call it a 8.0 but it is a 8.25 and uses the same gears as a gm 8.25 to keep costs down. performance he needs at least a 4.88 becaice of extra drag that most ignore. with 4.56s it will feel like maybe a 3.73 at most performance wise and hurt towing at serious weight. tell ya what genius... why dont you post a source and part numbers for these mythical 4.88 gears you keep speaking of and the rest of us will shut up. yg gm8.25-488r same reverse roatation gearset as gm uses. you really are clueless arent you in the link below you will see it and aam make a max of 4.78 themselves but yukon makes them to 5.13. aam also makes a 7.25 and a 9.25 version http//www.aam.com/technology/techproddlfrontaxle825.html ----------------- the snoman www.thesnoman.com .
From : tom lawrence
ive searched and call about 10 vendors and no one has anything beyond the 4.56 gears. you have a source for 4.88s not when used in a dodge. theres a listing for 4.88s in a gm 9.25 but thats not going to help you. 4.56 is the best youre going to do and itll be fine. youll have almost the same final drive ratio as you had with your 3.92s and stock tires just a hair shorter which means youll be turning about 50 more rpms at 65mph with the 4.56/35 combo compared to the 3.92/30.5 combo .
From : snoman
on sat 29 jul 2006 015027 gmt tom lawrence tnloaswpraemnmcien5g@earthlink.net wrote ive searched and call about 10 vendors and no one has anything beyond the 4.56 gears. you have a source for 4.88s not when used in a dodge. theres a listing for 4.88s in a gm 9.25 but thats not going to help you. 4.56 is the best youre going to do and itll be fine. youll have almost the same final drive ratio as you had with your 3.92s and stock tires just a hair shorter which means youll be turning about 50 more rpms at 65mph with the 4.56/35 combo compared to the 3.92/30.5 combo first a 1500 likely does not have a 9.25 front axle but even if it does tom should know the a 9.25 aam front axle made for dodge uses the exact same ring and pinion as the gm 9.25ifs. this was done to limit production costs for axle so you can use gm gears in it. there are not two different sets or styles of 9.25 gears made as it would not be cost productive at all. just like dodge started using the aam 11.5 in rear of some trucks that uses same ring and pinion as gm app. no different than d44s or d60s used in fords dodges or gms there are the same unless they are reverse rotation. also the d50 used by ford in some apps uses d44 gears. one more thing while you comparison is close with gears you leave out that truck does not work in a vacum on steel wheels and it will not give 3.92 like perfomance with 4.56s because of increased rolling resistance and drag from big tires and lifted truck. the rpm may match but performance will not yet so many like yourself seem stuck on the rpm thing as being the solution. if he wants 3.92 with stock tire like performance he needs at least a 4.88 becaice of extra drag that most ignore. with 4.56s it will feel like maybe a 3.73 at most performance wise and hurt towing at serious weight. ----------------- the snoman www.thesnoman.com .
From : tom lawrence
guess again clueless. aam does not make a 8.0 ifs axle. they make a 8.25 one that dodge uses too they make a cast iron pig and alum pig version again dribble from you. the blind leading the blind. dodge may call it a 8.0 but it is a 8.25 and uses the same gears as a gm 8.25 to keep costs down. amazing. so the four service manuals i have that all show the ring gear to be 8.0 in diameter are wrong or are you saying gms 8.25 uses an 8.0 ring gear strange that all their other differentials are named for the exact dimension of the ring gear isnt it lets see.... heres the dodge specs copied straight from the 2003 fsm http//home.earthlink.net/tlawren349/diffspecs.jpg and heres the ring gear spec. for the gm 8.25 whaddaya know - they say its 8.25 http//www.differentials.com/pdfs/27.pdf now - you tell me how 8.0 = 8.25 i know i know.... the dodge manual is wrong. its really an 8.25 gear - they just felt like printing 8.0 for the last four years just to confuse people. youve actually held one of these in your hand and personally verified it to be 8.25 right lets also remember that homebrewer called several different vendors and shops and they all told him the same story only 4.56 available for his axles. i guess they were all clueless too huh .
From : azwiley1
maybe snobrain had his head underwater too long while ice fishing again. admit it tom you know he is write! lol guess again clueless. aam does not make a 8.0 ifs axle. they make a 8.25 one that dodge uses too they make a cast iron pig and alum pig version again dribble from you. the blind leading the blind. dodge may call it a 8.0 but it is a 8.25 and uses the same gears as a gm 8.25 to keep costs down. amazing. so the four service manuals i have that all show the ring gear to be 8.0 in diameter are wrong or are you saying gms 8.25 uses an 8.0 ring gear strange that all their other differentials are named for the exact dimension of the ring gear isnt it lets see.... heres the dodge specs copied straight from the 2003 fsm http//home.earthlink.net/tlawren349/diffspecs.jpg and heres the ring gear spec. for the gm 8.25 whaddaya know - they say its 8.25 http//www.differentials.com/pdfs/27.pdf now - you tell me how 8.0 = 8.25 i know i know.... the dodge manual is wrong. its really an 8.25 gear - they just felt like printing 8.0 for the last four years just to confuse people. youve actually held one of these in your hand and personally verified it to be 8.25 right lets also remember that homebrewer called several different vendors and shops and they all told him the same story only 4.56 available for his axles. i guess they were all clueless too huh .