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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Pinion Gear Question
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Topic Review (Newest First)
05-06-2004 06:03 AM
dollybud Thanks a million, you explained that very WELL! I'll give it a try this week-end and let you know how I make out. Again,thanks.
05-05-2004 09:34 PM
Robinson Robin 85406 explained that pretty well I agree
05-05-2004 06:53 PM
85406 I thought maybe I saw your problem so here goes. The 25 in\lb has nothing to do with how tight the pinion nut is. It is the amount of drag required to turn the pinion and carrier. So, the process. You usually have to have a fixture to fit on the pinion yoke as you are going to have to stop it from turning with a lot of torque. Fixture on, tighten the pinion nut to lets say 100 ft\lb. take the fixture off and then use the in\lb torque wrench and spin the pinion. See what the reading is to make it spin around. ( I must add there should be no axles in the side gears at this point)
If is is below 25 in\lb, put the fixture back on and turn the pinion nut a little more, ( you might be up to 150 ft\lb by now) take it all off and check with the in\lb for what torque to spin the pinion nut. Now keep doing this until the torque to spin it is 25 in\lb. At that time the pinion nut is correct. ( probably took 200 ft\lb to get to this point) If this still doesn't make sense, just say so and we will keep doing it until you understand the process.
05-05-2004 04:08 PM
dollybud 85406, I'm kinda confused here. It is a GM rear end with crush sleeve. It takes very little effort to put the pinion nut on with 25 inch/pounds. (I had a hard time findin a in/lb torque wrench. So after every thing is set up do you tighten the pinion nut up as high as you can? Thanks for the quick response, greatly appreaciated if any one else wants to jump in.
05-05-2004 12:27 PM
85406 you tighten the pinion nut until you have 25 in\lb drag and the pinion nut is correct. You must remember that it will probably take about 200 ft\lb to get to that point and crush the sleeve if that is the type of rear you are working on. So, to answer your question you do tighten the pinion nut and no there isn't a ft\lb torque figure for the pinion nut.
05-05-2004 10:24 AM
Pinion Gear Question

After setting pinion gear preload, new bearings NOTE: 25 inch/pounds and setting in carriier checking backlash and gear pattern how much more torgue or how much do you tighen the pinion nut? It must be in foot/pounds but I can't seem to find it anywhere and there is nothing on the Richmond instructions, as a matter of fact it doesn't even tell you to tighen it but you must right? Thanks in advance for any help and info as usual.

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