Has anybody every?
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Has anybody every?
Installed some kind of temp sensor on the rear end and auto tranny?
I have rear end problems every couple of years. I now have a problem. When the rear heats up from some spirited driving and it doesn't take much. I get terrible snapping and popping once I get to my destination and start doing slow tight turns in forward or reverse. In the past it would start out just like this and the posi units always broke within a short period of time.
It's a Richmond Gear 4.11 super duty rearend with Toms Differnetial $685 posi unit and custom hardened yokes. Bigger U-joints and bigger half shafts.
I'm using 85-120 weight fully synthetic gear oil with two tubes of posi lube and a antifriction additive.
I have rear end problems every couple of years. I now have a problem. When the rear heats up from some spirited driving and it doesn't take much. I get terrible snapping and popping once I get to my destination and start doing slow tight turns in forward or reverse. In the past it would start out just like this and the posi units always broke within a short period of time.
It's a Richmond Gear 4.11 super duty rearend with Toms Differnetial $685 posi unit and custom hardened yokes. Bigger U-joints and bigger half shafts.
I'm using 85-120 weight fully synthetic gear oil with two tubes of posi lube and a antifriction additive.
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Has anybody every? (jerryjfunk)
Your not the first person to tell me to change back. I only went with synthetic just because i'm willing to try anything. Some of the C-5 road racers are running rearend coolers. I just want to see how hot it's really getting
Drifting
Joined: Apr 2002
Posts: 1,736
Likes: 37
From: Stockton Ca
Re: Has anybody every? (gkull)
I remember reading somewhere that gears that low put a strain on the rearend. Something about one gear being so small that it doesn't have enough teeth/surface area to take the strain. Kind of like the reverse of a 10 speed bile. High gear is very small, very few teeth. If the chain must make a tight turn to follow the sprocket! The gist was that 3:70 was the lowest gear w/o extra wear. Hope this makes sense.
Le Mans Master
Joined: Apr 2000
Posts: 7,562
Likes: 9
From: B'Ville NY
Cruise-In III Veteran
St. Jude Donor '05
Re: Has anybody every? (gkull)
George I'm running Amsoil synth. in the rearend. My friend races his car at Watkins Glen with the same oil and hasn't had any problems with his.
I'd call Tom's & ask their opinion since you are buying quality parts :yesnod: . Every couple years seems excessive.
I've heard of the rearend coolers but have never seen them advertised. From what I understand, you will need a pump to rotate the fluid to & from the cooler.
I'd call Tom's & ask their opinion since you are buying quality parts :yesnod: . Every couple years seems excessive.
I've heard of the rearend coolers but have never seen them advertised. From what I understand, you will need a pump to rotate the fluid to & from the cooler.
Pro
Joined: Jun 2001
Posts: 683
Likes: 0
From: Calgary
Re: Has anybody every? (gkull)
Most big rigs have temp gauges on their diffs and trannies.. Maybe you could buy one at a Kenworth dealer or something.
If you drive very fast (100 +) for sustained speeds, I could see your diff heating up, especially in the hot desert. The Mustang Cobra R came stock with a diff cooler.
Sounds like your posi clutch plates are binding up. Are you running stock springs, heavier springs, or a shimmed unit? How often do you change the oil? How many miles do you drive?
If you drive very fast (100 +) for sustained speeds, I could see your diff heating up, especially in the hot desert. The Mustang Cobra R came stock with a diff cooler.
Sounds like your posi clutch plates are binding up. Are you running stock springs, heavier springs, or a shimmed unit? How often do you change the oil? How many miles do you drive?
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Has anybody every? (gkull)
I had a problem that sounds similar to yours a long time ago. The way the car sounded and jumped around, I just knew I had teeth floating around, in there. After asking eveyone I knew and many that I didn't, a wise old guy told me he could solve all my problems for $10.00, guarenteed. When I took the car to him, I watched as he drained and refilled the rear end. Problem solved! That was back in the olden days, before synthetics and when you could still buy "posi" grease. I'll bet a nickel to a donut, that if you change the rear end grease (try dino oil) and add the posi additive, you'll cure the problem. Good luck.
