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Author Topic:   Gear Oil Question
racenmotorsports
Dirt Maniac

Total posts: 169
posted April 09, 2004 08:49 PM  
I have to run a GM rear end. I've welded the spider gears and am ready to put the thing back together. How much am I supposed to put in this thing? The manual says 1 3/4 quarts, I know about 2 came out and I've seen 1 gallon on here, but I don't know if the 1 gal. was for GM 10 bolt.

Appreciate the help.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 09, 2004 08:51 PM  
dont be afraid to put in a little extra. when you corner alot of the gear oil will run down the axle tubes. i use 1 gallon in my 9".

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loojack
Dirt Maniac

Total posts: 196
posted April 10, 2004 12:42 PM  
I put a gallon in my 7.5 10 bolt. You need to go to the hardware store and get some 3/8 pipe thread pipe and a 90 elbow and cap. Run a pipe out of the fill hole and 90* up, about 3-4". It'll now hold a gallon. Take your fill plug to get the right size pipe. Hope this helps...loojack

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racenmotorsports
Dirt Maniac

Total posts: 169
posted April 10, 2004 07:55 PM  
thanks for the help. I think I'll take your advice loojack.

Gene
Dirt Freak

Total posts: 396
posted April 11, 2004 06:10 AM  
I'd use a 50% blend of Lucas oil additive. That stuff really dose seem to work. For the 6 bucks its cheap protection.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 11, 2004 09:26 AM  
This will be our 10th consecutive year to race and we have always filled our 9 inch until the fluid started to run out of the fill hole. We have never had one gear problem. The lucas is a good ideal also.

Raz_900
Dirt Forum Champ
Total posts: 635
posted April 12, 2004 11:33 AM  
too much isn't always always a good thing. If it's overfull, the gear will be spinning in more oil costing HP. 90w isn't all the easy to spin a big paddle wheel in (which is what the ring gear is like).

We fill our's up (9") with a finger partially covering the fill hole to get about 3 qts in. The same 5.14 gears is on it's 4th season now and looks perfect. Also have another set of 5.14s and a 5.67 used they same way that look great.

It might only be a couple HP, but that might be the couple HP you need to win by a bumper some day.

[This message has been edited by Raz_900 (edited April 12, 2004).]

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