http://classicoldsmobile.com/forums en Fri, 03 Sep 2010 06:12:36 GMT vBulletin 60 http://classicoldsmobile.com/forums/images/misc/rss.jpg http://classicoldsmobile.com/forums http://classicoldsmobile.com/forums/drivetrain-differentials/26367-12-bolt-posi.html Mon, 30 Aug 2010 05:23:51 GMT ? will a 12 bolt posi out of a 68 chevelle ss fit in a 72 cutlass which currently has 10 bolt limited slip rear end and if so are there any... ? will a 12 bolt posi out of a 68 chevelle ss fit in a 72 cutlass which currently has 10 bolt limited slip rear end and if so are there any adjustments I need to make Thanks Robbing Peter to pay Paul LOL :cool: ]]> Drivetrain/Differentials egknz http://classicoldsmobile.com/forums/drivetrain-differentials/26367-12-bolt-posi.html http://classicoldsmobile.com/forums/drivetrain-differentials/26366-city-driving-3-42-gears.html Mon, 30 Aug 2010 05:20:36 GMT Just curious what RPM's would be like in the city (say 25-40mph) with a 3.42 posi in a 350 4bbl and TH350 with specs similar to a 1970 350 (hopefully near W31 specs)?

I rarely go on the highway, but still would like to. Wondering if 3.73 or 3.90's would be overkill, but on the other hand do not want to be bogging in the city. I also do not want to add an overdrive trans. Want to keep that as stock as possible (other than perhaps beefier internal trans mods). ]]> Drivetrain/Differentials oldzy http://classicoldsmobile.com/forums/drivetrain-differentials/26366-city-driving-3-42-gears.html http://classicoldsmobile.com/forums/drivetrain-differentials/26356-upgrade-28-spline-30-spline-axles.html Mon, 30 Aug 2010 00:29:06 GMT Just wondering how much hassle (or even worth it) it would be to upgrade a 8.5" corporate 10 bolt w/ 28-spline rear end to a 30-spline resulting in 30/30 splines for both axle and pinion?

In that case, what Eaton posi unit would be needed, since the 28-spline one below will no longer work?

Eaton Posi 19557-010
http://www.summitracing.com/parts/ETN-19557-010/ ]]> Drivetrain/Differentials oldzy http://classicoldsmobile.com/forums/drivetrain-differentials/26356-upgrade-28-spline-30-spline-axles.html http://classicoldsmobile.com/forums/drivetrain-differentials/26278-need-help-g-body-differential.html Fri, 27 Aug 2010 12:23:07 GMT I have inherited two g-body differentials, one of which is rust free and has new backing plates, but the side gears have been destroyed. The other is... I have inherited two g-body differentials, one of which is rust free and has new backing plates, but the side gears have been destroyed. The other is so rusted out that the axle tubes could fracture. My plan is to transfer the side gears of this one to the other. I have removed the pinion shaft bolt on both and it is an 8mm about 1/2" long. The pinion shaft is still locked in place. What am I missing?? ]]> Drivetrain/Differentials oldsthunder http://classicoldsmobile.com/forums/drivetrain-differentials/26278-need-help-g-body-differential.html http://classicoldsmobile.com/forums/drivetrain-differentials/26245-help-runout-bolt-prop-shaft-position.html Thu, 26 Aug 2010 06:27:20 GMT I replaced the differential seal on my car,,,I got it all done and drive shaft back in and i was reading my shop manual and it stated before bolting... I replaced the differential seal on my car,,,I got it all done and drive shaft back in and i was reading my shop manual and it stated before bolting prop flange to differential flange check for run out bolt,If it has a runout bolt instal prop flange straddling the runout bolt,,if no runout bolt is present install prop shaft in any position,,After getting under my car i seen mine does have a runout bolt,,,What does straddling the runout bolt mean...How do i know if it is in the righ position.., ]]> Drivetrain/Differentials 1973olds98 http://classicoldsmobile.com/forums/drivetrain-differentials/26245-help-runout-bolt-prop-shaft-position.html http://classicoldsmobile.com/forums/drivetrain-differentials/26239-fluid-capacity.html Thu, 26 Aug 2010 02:51:28 GMT final stages of starting up my car after a transmission and engine rebuild,,,,My question is how much of the following is needed 1. transmission... final stages of starting up my car after a transmission and engine rebuild,,,,My question is how much of the following is needed
1. transmission fluid
2. differential fluid

Also what type of differential fluid do i need to use...Its a 73 olds 98 with all stock equipment... ]]> Drivetrain/Differentials 1973olds98 http://classicoldsmobile.com/forums/drivetrain-differentials/26239-fluid-capacity.html http://classicoldsmobile.com/forums/drivetrain-differentials/26192-north-american-made-ring-pinion-gears.html Wed, 25 Aug 2010 05:20:59 GMT Who offers 100% USA made (or Canada - we make things here?) ring and pinion gears?

If my gears say 'Made in China' on the box or something, I think I will go postal. I might be able to tolerate Italy or Germany perhaps.

I just want 100% USA or Canadian made rear end parts is all. I hear Richmond is 100% Made in USA... but Motive is not for example. On that alone, I would tolerate the apparent noise Richmond's make. ]]> Drivetrain/Differentials oldzy http://classicoldsmobile.com/forums/drivetrain-differentials/26192-north-american-made-ring-pinion-gears.html http://classicoldsmobile.com/forums/drivetrain-differentials/26157-8-5-posi-de-code.html Tue, 24 Aug 2010 11:42:46 GMT Hi I'm new here (from Eastern Canada) I have a 73 Cutlass Supreme and planning to change out the running gear dropping a 455 in it with a th400.

I picked up a 8.5 posi with a 3 ser carrier (410408N) but havn't a clue what the other numbers I found are, can someone decode them

Stamped on the outside housing 8NV G4115

On the ring gear 2GM 1235124 15 41 4 84
I manage to search and find out the 15 41 is for 2.73

This rear end seems to be a direct bolt in, it's the same width and the spring and shock mountings seem to be the same. It also had a sway bar.

This is a great site for getting info and been lurking for the past year.

Thanks
Leo ]]> Drivetrain/Differentials atlantic73 http://classicoldsmobile.com/forums/drivetrain-differentials/26157-8-5-posi-de-code.html http://classicoldsmobile.com/forums/drivetrain-differentials/26099-want-upgrade-3-42-posi-one-wheel-2-73-a.html Sun, 22 Aug 2010 19:21:32 GMT I have a '72 Cutlass Supreme and want to upgrade to 3.42 posi from the one wheel deal 2.73 I have now. I want all new parts, but am a bit clueless as to what I need.

Am I correct in that what I need are a Ring and Pinion gear set, posi unit/carrier, and then the gaskets, seals, etc. rebuild kit? I would like to get a Richmond gear set and an Eaton posi unit, as I have heard they are one of the best. School me otherwise if not. I am assuming 8.5" and 30-spline?

I also want to completely disassemble the rear end, and powder coat it. ]]> Drivetrain/Differentials oldzy http://classicoldsmobile.com/forums/drivetrain-differentials/26099-want-upgrade-3-42-posi-one-wheel-2-73-a.html http://classicoldsmobile.com/forums/drivetrain-differentials/26009-lame-o-axle.html Thu, 19 Aug 2010 20:31:31 GMT I have a 68 442 convertible with the dreaded "O" axle rear end and 2.56 gears. Can someone tell me how many splines does the pinion have? Thanks! ]]> Drivetrain/Differentials Stevec http://classicoldsmobile.com/forums/drivetrain-differentials/26009-lame-o-axle.html http://classicoldsmobile.com/forums/drivetrain-differentials/25903-best-way-break-pinion-nut-replace-seal.html Mon, 16 Aug 2010 06:37:37 GMT I just cant seem to break the nut lose to replace the seal,,any suggestions? I just cant seem to break the nut lose to replace the seal,,any suggestions? ]]> Drivetrain/Differentials 1973olds98 http://classicoldsmobile.com/forums/drivetrain-differentials/25903-best-way-break-pinion-nut-replace-seal.html