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Re: Transmission grinding in first
LeeD #1374924 Wed Aug 26 2020 04:38 PM
Joined: Jul 2014
Posts: 234
1
Shop Shark
When you replaced the trans, did you use a jack for support? Or just do a bench press of the trans? In the process of getting everything lined up if you let the trans hang in the splines while you rest your arms before the pilot snout is engaged with the bearing, the force can bend the clutch disc. The result is usually clutch drag as you describe or clutch chatter on take off or both. If it doesn't chatter you may be able to rectify the symptom with an adjustment. But you can only go so far until the throw-out bearing is always engaged. In that case, the bearing will eventually fail and/or the clutch will slip.

There is also the possibility that the rivets, on which the diafram spring pivots, are loose and moving slightly or the spring is distorted. I had this happen on a reman clutch a few years ago. It was replaced on warranty but I still had to do the job twice.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Transmission grinding in first
LeeD #1374951 Wed Aug 26 2020 08:09 PM
Joined: Mar 2017
Posts: 251
L
LeeD Offline OP
Shop Shark
I used a regular floor jack to hold the weight, and headless bolts for alignment. No problems there.

Lee.


1956 Chevy 3200, 235 w/3 speed
Re: Transmission grinding in first
LeeD #1374964 Thu Aug 27 2020 12:25 AM
Joined: Feb 2004
Posts: 21,062
H
Boltergeist
What lubricant are you running? A synthetic lube, or one that's thinner than the original won't have enough drag to make the gears stop turning quickly when the clutch pedal is pushed. Straight 90 weight mineral oil such as the "Ford tractor" gear lube that Tractor Supply sells is probably as good as it gets for stovebolt transmissions, both 3 and 4 speeds.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Transmission grinding in first
LeeD #1375046 Thu Aug 27 2020 10:30 PM
Joined: Mar 2017
Posts: 251
L
LeeD Offline OP
Shop Shark
When I changed the oil 2 years ago, I put in 80W-90 gear oil. I guess not as thick as the straight 90 weight.


1956 Chevy 3200, 235 w/3 speed
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