a 833 4 speed trans

plymouthdave · Dec 21, 2020

Can any one help ? I have a 70 GTX 4 speed. Just had the transmission rebuilt last year. Now grinds going into reverse and hard going into low gear. The guy that rebuilt it thinks it is the input shaft, Looks good to me. Input shaft bushings are in good shape. He thinks the input shaft is moving up and down too much causing vibration. There has always been movement in it. Does anyone know what the thickness of the fly wheel is supposed to be? Thank you in advance!

toolmanmike · Dec 21, 2020

Sounds like clutch adjustment. It's not fully disengaging. The first thing to check. When I am alone with no helper, I take the inspection cover off and adjust the linkage so the throw out bearing surface is 3/16" from the pressure plate fingers. I slide out and cycle the pedal a few times and double check the gap. That will get you where you need to be.

AR67GTX · Dec 21, 2020

Yes, those are signs of the clutch not releasing completely. I would adjust for less free play at the top of the pedal before throwing money at it.

Vitamin_A12 · Dec 21, 2020

Agree! Your clutch isn't fully disengaging making it hard for the blockers to stop the desired gear choice.

Jeremiah · Dec 21, 2020

There is no input bushing on an a-833, only a bearing held in by a snap ring. Did you check the runout on the bellhousing?

I agree that the clutch requires an inspection.

chignikred · Dec 21, 2020

All the clutch adjustment ideas are good due dilligence, but engagement is the problem he describes in text. Play in shaft will be bellhousing centering as suggested, Or poor quality front bearing, Or mis centered crank bushing / wear.
The issue of trouble engaging 1 st points to worn or bad brass stop rings. Plain and simple.

Jeremiah · Dec 22, 2020

A clutch disc dragging will make it hard to shift into reverse and 1st as described.

moparmarks · Dec 22, 2020

Did it do this right after the rebuild? The side shifter plate is an adjustment for the reverse lockout. If the plate isn't adjusted right it can cause this problem.

Nick Panaritis · Dec 30, 2020

plymouthdave said:
Can any one help ? I have a 70 GTX 4 speed. Just had the transmission rebuilt last year. Now grinds going into reverse and hard going into low gear. The guy that rebuilt it thinks it is the input shaft, Looks good to me. Input shaft bushings are in good shape. He thinks the input shaft is moving up and down too much causing vibration. There has always been movement in it. Does anyone know what the thickness of the fly wheel is supposed to be? Thank you in advance!

Sounds like a clutch issue. Verify adjustment. Should have 1'' play on pedal.

69sunfireGTX · Dec 30, 2020

There is no synchronizer in reverse. it is going to grind if you try going directly in reverse gear. Does it grind when you try to put it into second or third when at idle?

watermelon · Dec 30, 2020

agreed with 69sunfireGTX

my tko500 came with instructions to put into a drive gear immediately before placing into reverse due to not having synchronizers. if jumping directly into reverse grinding will occur

...and follow Nick’s advice too...he knows a few things about Mopars

watermelon

sarjag · Jan 8, 2021

I had a similar problem recently with a freshly rebuilt 4-speed muncie. I tried all sorts of adjustments. Nothing helped. Turns out my roller pilot bearing had failed so the input shaft did not fully release. Check your pilot bearing.

a 833 4 speed trans

plymouthdave

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toolmanmike

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AR67GTX

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Vitamin_A12

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Jeremiah

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chignikred

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Jeremiah

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moparmarks

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Nick Panaritis

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69sunfireGTX

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watermelon

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sarjag

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