Dodge Rear end
From : footman21
Q: will a rearend from a 96 dodge 2 wd fit a 98 dodge 4 wd -- more information at http//www.talkaboutautos.com/faq.html .
Replies:
From : joe
tbone fatchance@noway.now wrote in yea i believe it. that rear has turned into a real pos. perhaps if they used quality parts again that rear would return back to the dependable one it once was. hell i didnt even push it that hard. i have to believe that the unit was defective to begin with. cant believe theyre all that shoddy. hope the new ones better... joe black 03 dakota 5.9 r/t cc calypso green 93 mustang 5.0 lx hatch with a few goodies .
From : steve lusardi
maybe. remember the rear axle gear ratio must match the front. please note that the ratio between the front and rear is not exactly the same. if for example the rear diff is 3.55 to 1 then the front will be 3.54 to 1. this is necessary because when in 4 wheel drive the front must be boss. i believe the spool is the same on the 1500s but there are different ones for the 2500s and 3500s. you have to look no matter what. steve will a rearend from a 96 dodge 2 wd fit a 98 dodge 4 wd -- message posted using more information at http//www.talkaboutautos.com/faq.html .
From : steve lusardi
tom i have been told by multiple reputable sources of the front end being boss requirement. of course i have personally never made the experiment of trying the different combinations myself so personally i do not know. i do have to say that your explanation makes more common sense and it can be supported by your worn/different tire example. so i will stand corrected. this exchange also illustrates the correctness of the factory warning label not to use 4 wheel drive during good traction conditions as well. all wheel drives of course use a viscous coupling to relieve the driveline stress during speed differences from front to rear and do not wear the warning label. steve please note that the ratio between the front and rear is not exactly the same. if for example the rear diff is 3.55 to 1 then the front will be 3.54 to 1. not true.... look at any hd 4x4 where the same manufacturer is used both front and rear and youll see exactly the same ratio. on my 03 its 3.731 front and rear... 41 teeth on the ring gear 11 on the pinion gear. the reason you sometimes would up with 3.54 in the front and 3.55 in the rear or 4.10/4.11 was due to the use of two different axle manufacturers. in the dodge world it was dana up front and chrysler in the rear for any 1/2-ton 94-01. for the 3.5 gear ratio dana used 39 teeth on the ring gear 11 on the pinion for a 3.5454 ratio. chrysler also used the same tooth counts but just called their ratio 3.551. in the case of 4.10/4.11 one set used 41/10 while the other used 45/11. now dont ask me why the 45/11 set is called 4.11 when mathematically it works out to 4.09 but thats the way it is. now why can they do this because 1/100th of a revolution is practically meaningless. on a typical 30 tire with a 4.10 gear ratio it takes obviously 4.1 rotations of the driveshaft to produce one full rotation of the tire covering 94.2478. that same 4.1 rotations on a 4.09 gearset is going to produce 1.0024 revolutions causing the tire to attempt to cover 94.4739 for a difference of .22 each rotation. now thats the same as if both axle ratios were the same yet one set of tires was 30 tall while the other was 30.071 tall. a difference in tire diameter of seventy-one thousanths or about 1/16 of an inch. so a .01 difference in axle gear ratios isnt any more significant than having one set of tires a little more worn than the other or inflated a little higher/lower than the other or simply carrying more load than the other. its not significant enough to cause any problems which is why they can be used together in a 4x4 drivetrain without issues. in this case a difference of only .01 is close enough. .
From : tom lawrence
please note that the ratio between the front and rear is not exactly the same. if for example the rear diff is 3.55 to 1 then the front will be 3.54 to 1. not true.... look at any hd 4x4 where the same manufacturer is used both front and rear and youll see exactly the same ratio. on my 03 its 3.731 front and rear... 41 teeth on the ring gear 11 on the pinion gear. the reason you sometimes would up with 3.54 in the front and 3.55 in the rear or 4.10/4.11 was due to the use of two different axle manufacturers. in the dodge world it was dana up front and chrysler in the rear for any 1/2-ton 94-01. for the 3.5 gear ratio dana used 39 teeth on the ring gear 11 on the pinion for a 3.5454 ratio. chrysler also used the same tooth counts but just called their ratio 3.551. in the case of 4.10/4.11 one set used 41/10 while the other used 45/11. now dont ask me why the 45/11 set is called 4.11 when mathematically it works out to 4.09 but thats the way it is. now why can they do this because 1/100th of a revolution is practically meaningless. on a typical 30 tire with a 4.10 gear ratio it takes obviously 4.1 rotations of the driveshaft to produce one full rotation of the tire covering 94.2478. that same 4.1 rotations on a 4.09 gearset is going to produce 1.0024 revolutions causing the tire to attempt to cover 94.4739 for a difference of .22 each rotation. now thats the same as if both axle ratios were the same yet one set of tires was 30 tall while the other was 30.071 tall. a difference in tire diameter of seventy-one thousanths or about 1/16 of an inch. so a .01 difference in axle gear ratios isnt any more significant than having one set of tires a little more worn than the other or inflated a little higher/lower than the other or simply carrying more load than the other. its not significant enough to cause any problems which is why they can be used together in a 4x4 drivetrain without issues. in this case a difference of only .01 is close enough. .
From : roy
tom so i will stand corrected. said that to him a couple of times myself.vbg roy .
From : nosey
tom lawrence wrote please note that the ratio between the front and rear is not exactly the same. if for example the rear diff is 3.55 to 1 then the front will be 3.54 to 1. not true.... look at any hd 4x4 where the same manufacturer is used both front and rear and youll see exactly the same ratio. on my 03 its 3.731 front and rear... 41 teeth on the ring gear 11 on the pinion gear. the reason you sometimes would up with 3.54 in the front and 3.55 in the rear or 4.10/4.11 was due to the use of two different axle manufacturers. in the dodge world it was dana up front and chrysler in the rear for any 1/2-ton 94-01. for the 3.5 gear ratio dana used 39 teeth on the ring gear 11 on the pinion for a 3.5454 ratio. chrysler also used the same tooth counts but just called their ratio 3.551. in the case of 4.10/4.11 one set used 41/10 while the other used 45/11. now dont ask me why the 45/11 set is called 4.11 when mathematically it works out to 4.09 but thats the way it is. now why can they do this because 1/100th of a revolution is practically meaningless. on a typical 30 tire with a 4.10 gear ratio it takes obviously 4.1 rotations of the driveshaft to produce one full rotation of the tire covering 94.2478. that same 4.1 rotations on a 4.09 gearset is going to produce 1.0024 revolutions causing the tire to attempt to cover 94.4739 for a difference of .22 each rotation. my 91 ford had 3.54 gears in the front and 3.55 gears in the rear both dana 44s. i always thought they intentionally mis-matched the gearsets to operate automatic locking hubs. the front ratio was lower so you could lock the hubs while driving forward and unlock them while in reverse. if the gearsets were matched you would have to drive a very long distance if going straight before the hubs would lock or unlock. -- ken .
From : tom lawrence
my 91 ford had 3.54 gears in the front and 3.55 gears in the rear both dana 44s. count the teeth... im willing to bet youll find the same tooth count 46/13 as thats all dana lists for their 44 in 3.5 ratio. they show a dana 35 thats got a 3.55 ratio 39/11. i always thought they intentionally mis-matched the gearsets to operate automatic locking hubs. the front ratio was lower so you could lock the hubs while driving forward and unlock them while in reverse. if the gearsets were matched you would have to drive a very long distance if going straight before the hubs would lock or unlock. auto hubs lock due to the torque input from the transfer case. theres plenty of torque there to overcome the springs in the auto hubs without needing to bind up the drivetrain. again - the .01 difference is so small as to be negligible. if that was really the desired effect such effect could easily be undone by difference in tire wear tire pressure or load as discussed above. remember that a difference of just over 1/32 of tread is all thats needed to offset a .01 difference in gear ratio. .
From : tom lawrence
tom i have been told by multiple reputable sources of the front end being boss requirement. i know - ive heard that before as well. but i can show you pictures of my stock 4.10 gearsets from my 99 ram still got em around here somewhere... thought i might make clocks out of the ring gears with the same 41-tooth ring gears and 10-tooth pinions. on my current truck and 03 with aam9.25 up front and aam11.5 in the rear both gearsets use 41/11 ring/pinion gears for a 3.72727272 3.73 ratio. again both are exactly the same. .
From : big al
my 91 ford had 3.54 gears in the front and 3.55 gears in the rear both dana 44s. count the teeth... im willing to bet youll find the same tooth count 46/13 as thats all dana lists for their 44 in 3.5 ratio. they show a dana 35 thats got a 3.55 ratio 39/11. i always thought they intentionally mis-matched the gearsets to operate automatic locking hubs. the front ratio was lower so you could lock the hubs while driving forward and unlock them while in reverse. if the gearsets were matched you would have to drive a very long distance if going straight before the hubs would lock or unlock. auto hubs lock due to the torque input from the transfer case. theres plenty of torque there to overcome the springs in the auto hubs without needing to bind up the drivetrain. again - the .01 difference is so small as to be negligible. if that was really the desired effect such effect could easily be undone by difference in tire wear tire pressure or load as discussed above. remember that a difference of just over 1/32 of tread is all thats needed to offset a .01 difference in gear ratio. my 71 bronco had 4.10 dana 44 up front and a 4.11 9 ford in back. my 79 chevy had exactly the same ratios dana 60f in front 14 bolt chevy in back. al .
From : tbone
yea i believe it. that rear has turned into a real pos. perhaps if they used quality parts again that rear would return back to the dependable one it once was. -- if at first you dont succeed youre not cut out for skydiving this morning i went to have the 12000 rear end fluid change done and the service manager comes in and tells me im not taking my truck home. of course i asked him why not and he told me the rear end was shot. posi was in pieces. interesting on an 03 just shy of 14000 miles. as luck would have it they actually had a rear in stock the guy who it was originally ordered for never came in for it so they fixed it today. the best part is that since the fluid change was part of the rear end fix i drove home with a brand new diff and fluid of course free of charge. joe black 03 dakota 5.9 r/t cc calypso green 93 mustang 5.0 lx hatch with a few goodies .