i420tom

iTrader: (11)

i have been reading up on this for over a while now and have found varied answers. i am installing a 3.73 gear set into my 7.5 10bolt. It is a barely used gm set that had no problems.

i have new timken bearings.

My main question is should pinion preload be set at 15inlbs or 25inlbs.. i have read both here on ls1tech.. bearings are yukon (timken)and yukon reccomends 12-15inlbs.

Also what are the carrier preload specs and does that include the pinon preload or should the pinion preload be added when measuring?

backlash should be .006 right?

Please note that i want specs that will help my 10 bolt survive high stall and slicks at the track (i know it wont last forever but i want to last for a while)

thanks in advance.

i420tom

iTrader: (11)

also is this the best fluids to use? 2 quarts of 75w90 oil, and a bottle of GM's limited slip additive

i420tom

iTrader: (11)

anyone?

FirstYrLS1Z

iTrader: (4)

I set used pinion bearings to 10 in.lbs and new pinion bearings to 20 in.lbs.
Carrier bearings,if the pinion is set to 10 in.lbs. and with the carrier installed at an unknown preload and the torque wrench(dial type) shows me a 15 in.lb. reading,subtracting the 10 from the 15 gives me an added 5 in.lbs.If 3.23s' are in the carrier,the added 5 in.lbs. X 3.23 =16.15 in.lbs. carrier preload.
For carrier bearings I use the same figures as for pinion bearings.

alamantia

iTrader: (10)

https://ls1tech.com/forums/showthrea...421&highlight=

i420tom

iTrader: (11)

i read that once before alamatia..... Thats how i learned that i have the auburn. So i know i need the Limited slip additive. Thanks But still not sure EXACTLY what conventional fluid i should run.

Firstyearls1, how many rear ends have you set up like that? any of them go thru low 60ft times repeatedly, were they torsion or auburns? and also did you use solid pinion spacers or not.. i bought a solid and i think i will use it.

alamantia

iTrader: (10)

use 75w-90 GL-5

do you know how to shim the solid spacer? If not use a crush collar

i420tom

iTrader: (11)

yeah i think so i have not done it before but have read up on it. Please correct me if i am wrong here but basically to much shim and the pinion will never get enough preload. Correct shim will result in correct pinon preload with nut fully tightened. Too few shim will allow pinion preload to get higher than you want before the nut gets fully tight.
200-300 footpounds on the pinion nut and correct pinion preload will only be achieved with correctly shimmed solid spacer. is al lthis right?

alamantia

iTrader: (10)

preload is created when the inner and outter pinion bearings seat in their races, their tapered so they are only going to squeese so much before preload generates, the crush collar crushes to exactly where the bearings seat properly and keep tension between the two bearings. Once the bearings seat thay aint goin no where. The crush collar is made to crush for inperfections in machining of the rear housing. It will find where its suppose to crush to on its own. People have been using them for years with no failures not only in auto rears but reducers, gear boxes etc. People who tell you solid spacers keep the pinion form walking around are idiots and regurgitate information without using their brains. The fact the bearings are tapered and squeesed together by the tourque of the poinion nut keep the pinion from walking. The ONLY advantage to a solid pinion spacer that i could see is they are reusable. Use the collar, its fine.. really

i420tom

iTrader: (11)

can some others please chime in and say what preload they suggest also? even if it is the same as firstyrls1z's.

alamantia

iTrader: (10)

use this link stay away from the 420 for a few hours and take your time and do it right and it wont whine http://www.usgear.com/ring__pinion_installation.htm

i420tom

iTrader: (11)

lol.. i dont 420 anymore... im more concerned about it breaking than whining. Thanks for the link ill check it out.

alamantia

iTrader: (10)

me neither

this one too

http://www.drivetrain.com/ringpinioninstal.html

toadzq8

iTrader: (43)

Black lash for the GM gears should be in the 4-5 thou range, don't worry about the crush sleeve. I have used both and have not had any problems with the crush sleeve. I set preload on pinion at 15inlb without the seal, remove the yoke install the seal, bead of rtv at the base of the yoke a drop of red lock tite and then take it to 20-25 inlb. The diff I shim so that I get about one turn when I spin it ( pinion removed) if it spins more, add a couple of thou shim to tighten it up, if it will only make about a 1/2 turn remove a shim. do this before you set pinion depth and lash.