73 Dodge TIOGA B30 Driveshaft U joints 3 1/8" across not listed at jobber?

From : spud

Q: i tried to pick up a new set of driveshaft u joints for my 1973 dodge b30 tioga mohom its a 360 automatic with 1 piece driveshaft. the driveshaft universal joints i have dont appear to exist in the jobber computer parts book. the jobber supplied me with 1 precision 315g 3.25 overall across caps x 1.08 dia. caps casting #429 moe p usa 1 precision 316 3.65 overall across caps x 1.127 dia caps casting #352 moe p usa according to the parts book both joints could be 315gs or there could be a 315g on the front and a 316 on the rear. neither would fit they are too big my original crosses are both 3.137 overall across caps x 1.08 dia. caps casting # 509 s usa. is this a nominal 3 joint thats what the partsman insisted it had to be id tend to think it would be a nominal 3 1/8 joint and nope i didnt have a needle bearing jamed across the top of the cross when i measured. these are inside lock ring and cap grove single yoke universal joints. does anyone know of an online dimensional part number cross reference for u joints thanks; spud davidaanderson and that would be at shaw and a dot then ca .

Replies:

From : ray

spud wrote does anyone know of an online dimensional part number cross reference for u joints http//www.rockforddriveline.com/ujointinside.htm main site has some more cross reference stuff as well... i just went through this with my camaro... .

From : daniel j stern

on fri 16 jul 2004 spud wrote i tried to pick up a new set of driveshaft u joints for my 1973 dodge b30 tioga mohom its a 360 automatic with 1 piece driveshaft. the driveshaft universal joints i have dont appear to exist in the jobber computer parts book. the jobber supplied me with 1 precision 315g 3.25 overall across caps x 1.08 dia. caps and 1 precision 316 3.65 overall across caps x 1.127 dia caps according to the parts book both joints could be 315gs or there could be a 315g on the front and a 316 on the rear. neither would fit they are too big my original crosses are both 3.137 overall across caps x 1.08 dia. caps you have here an overall cross measurement overage of an utterly trivial 0.113 or approximately 1.4mm extra length on each side. this is not nearly enough to make the joint too big. it sounds as if you might not be aware of the proper installation procedure one cap is pressed into the yoke the cross is installed in that cap then the other cap is pressed into the yoke securing the cross. then measurements are carefully made and the cross is properly centered within the yoke. the jobbers right -- only two sizes were used. the smaller one is popularly known as type 7260 and the larger as type 7290 -- think these are spicer numbers but i could be wrong on that -- and there is a special adaptor u-joint made that is 7260-sized across one set of caps and 7290-sized across the other. but it sounds like 2ea 315g units g for greasable are what you needed and got so go install them and be well! does anyone know of an online dimensional part number cross reference for u joints online no i dont know of one but there are very good dimensional charts in the napa u-joints catalogue so hit your local uap. ds .

From : pater

take them out take them & a set of dial calipers to a knowlegeble parts house match them up have a nice day. good luck. .

From : rex b

on thu 15 jul 2004 232741 -0400 daniel j. stern dastern@127.0.0.1 wrote ||on fri 16 jul 2004 spud wrote || || i tried to pick up a new set of driveshaft u joints for my 1973 dodge || b30 tioga mohom its a 360 automatic with 1 piece driveshaft. the || driveshaft universal joints i have dont appear to exist in the jobber || computer parts book. || || the jobber supplied me with 1 precision 315g 3.25 overall across caps || x 1.08 dia. caps and 1 precision 316 3.65 overall across caps x || 1.127 dia caps according to the parts book both joints could be 315gs || or there could be a 315g on the front and a 316 on the rear. || || neither would fit they are too big my original crosses are both || 3.137 overall across caps x 1.08 dia. caps || ||you have here an overall cross measurement overage of an utterly trivial ||0.113 or approximately 1.4mm extra length on each side. this is not ||nearly enough to make the joint too big. i disagree. 1.4mm is about the thickness of a snapring. its certainly within typical variations across different u-joint numbers. motorhomes are know to have wildcard parts. it may be a nice standard m400 or whatever chassis but it could have bastard parts all over it. just because that bare chassis rolls into the motorhome plant with mopar u-joints doesnt mean it will still have them when the final product rolls out the other end. they may have decided to re-engineer that driveshaft for any number of reasons which seem good to them at the time. having said that generally speaking a 360 drivetrain uses the smaller 315 joints. 315 is a precision number. precision is a division of federal mogul. napa joints are probably precision. other good brands are neapco and spicer. you need to be aware that the critical dimension is not the length to the end of the caps but rather the length to the outer edge of the snapring grooves. in other words the inside width of the yoke. heres what precision says slightly abbreviated 1st measure od to make sure the cups are the same size. 2nd remove the seals from the cups and and re-install the cups on the cross. measure from the inside edges of the lockrings. then measure both lockrings thickness together. the sum of those two measurements should be equal to or slightly less than the yoke span. the chart shows a 315 to be 2.125 inches with 1.078 cups. **no other joint of this type uses that cup size**. 316 is 1/2 wider with 1.125 cups so theres no mistaking the difference. the combo 315/316 joint stern referred to is a 347 also make sure the yoke faces are still parallel. they can get adjusted during the removal process. good luck texas parts guy .