Not sure where to post this

[Madd Tinkerer]

The Gremlin has a interesting quirk . Every so often it seems to struggle to get going , thinking differential, has been known to spin rear wheels with very little effort . The other day it felt like i was towing a battleship any time i tried to accelerate quickly . Later on it was just fine. Transmission has fluid, and seems to operate correctly. Did about a week ago hear a loud clunk from somewhere thought it was a rock . It does seem to shudder a bit when hitting the brakes but I think that is a completely different issue. Any pointers in the right direction would be appreciated , if not will take it to the mechanic.

 

[MrPink]

This area is for feedback, help and suggestions for the forum itself. this should go in either transmission or a general area.

 

[sewlow]

Is there a G80 listing on the build sheet in the glove box?

 

[PlayingWithTBI]

The Gremlin has a interesting quirk

Pretty much all AMC Gremlins had quirks - JK

 

[Madd Tinkerer]

ok sorry about the late response back to the thread but been a bit chaotic around here. yes the truck has a g80 on the sticker in the glove box .

 

[someotherguy]

G80 is the RPO code for the locking rear end - Eaton Gov-Loc is the unit in your truck. They're not known for being durable. It may be going bad. Or, someone may have serviced it with the wrong lubricant, or added a "friction modifier" or "posi" additive, which is a big no-no with the Gov-Loc. Plain 80W90 GL5 gear oil is what it wants, nothing for positrac, no additives.

I've linked an article I posted on Chevytalk here - it includes the exact text from a GM TSB regarding the use of additives in the truck G80 unit

Locking rear axle (G80) - use additive? - Chevy Message Forum - Restoration and Repair Help

Chevy Forums FREE technical assistance for your restoration and repair. Model specific subject matter experts, classified ads and more.

chevytalk.org

You could try draining and re-filling with fresh lube to see if that helps its behavior. Be sure to look through the drained lube and in the bottom of the case for any "spare parts."

Richard

 

[Madd Tinkerer]

thank you will give that a go when it warms a bit if I don't have to work on truck when its below 50 I won't .