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I have this thing tuned as well as I can get it...Idle speed is correct etc. but going in and out of gear...Automatic Transmission...Park to Drive or Park to Rev it just seems to hit kinda hard. I have replaced all U-Joints, rebuilt transmission few months back...it has a new Progressive Shift Kit is what he called it. Says the higher R.P.M. the firmer the shift..all I can think of is the shift kit makes it bang into gear this firm? or maybe the rear end. I have not done anything to the rear end except check the fluid and drive it in some figure 8's to make sure possi wasn't grabbing or anything. Maybe someone has had this problem and can shed some light on it for me.
Thanks
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
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Depends on what kind of shift kit was used, and any other mods done to it.
How is the idle RPM?
If the line pressure was increased with the shift kit, that will make it hit hard when you put it in gear, as well as leaving out the cushion plates in the clutch drums, which is sometimes done on "hot rod" transmissions....you might want to have a talk with whomever did the trans, and ask a few questions...
Also, what kind of torque converter do you have?
Adams' Apple 2009-06-08 15:58:26
How is the idle RPM?
If the line pressure was increased with the shift kit, that will make it hit hard when you put it in gear, as well as leaving out the cushion plates in the clutch drums, which is sometimes done on "hot rod" transmissions....you might want to have a talk with whomever did the trans, and ask a few questions...
Also, what kind of torque converter do you have?
Joel Adams
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Bangs hard going in...................hmmm..........maybe Anything Goes should be where this fits.......ebo
made me type this..............
made me type this..............
corvette440hp
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B
Check your rearend cushion and make sure it's not worn or loose if you haven't already done so. The rearend moves up and down as you go from park to drive or park to reverse.
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When you say rearend cushion, are you referring to the differential mount bushing that is just forward and below the differential? If so I'll have to get under there and check it.
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B
Yep. That's the one. Couldn't think of bushing
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I checked out the bushing and it looks fine. I think Joel is right...I'll drop by and see the tranny guy and get some more info on what he put in this and post it here. I will say though it will sure break the tires loose going into 2nd.
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I forgot to add that with my idle set at 600 rpm in gear... it's at 900 t0 950 rpm in park. Does that sound about right. I wish I could get the idle speed down a little in Park. Is this possible?
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Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
If it sounds like a clunk coming from the rear of the car, it's a good possibility that it's the cushion. Mine made noise any time I shifted from park or neutral into a forward gear or reverse. Cushion replaced, problem solved - hope it's that easy for you. 
LukesVette 2009-06-10 08:15:07
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I picked up a new set of differential cushions today, my Chevy Dealer had them in stock.... the ones that are in there look OK but it's hard to tell with out pulling them out so I'll go ahead and change them tomorrow, BKVETTE your right...the dealer calls them cushions and the catalogs I have call them bushings. Still haven't got to talk to the tranny guy yet so maybe this will help. I'll let y'all know.
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