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Old 05-20-2009, 11:52 AM
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4l60E Slow Reverse

Back again. I did a rebuild kit on 1995 GMC K1500 because of slow/weak reverse.. The low reverse clutch packs were burnt up. After rebuild we still had same reverse issues so we took it apart and put in new spacer plate and different 2-4 band.
I just put it back together again last night and now I have great shifting from 2-3 and 3-4. 1st gear shifts fine at normal speed but is a little soft when I accelerate hard. The reverse is exactly the same as before. I have seen several sites that list this type of problem being: Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product.

I know the low reverse clutches are good from out last inspection. I also know the sunshell is good from inspection. My questions are. Does removing the checkball from its cage really work and which checkball is removed?
This really seems like a pressure issue to me. We had low pressure on idle in reverse but have not checked pressure at WOT.
Also what about reverse boost valve being replaced? Would this alleviate slow engaging/weak reverse problems?

Any and all ideas would be welcome.

Jay

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Old 05-20-2009, 05:43 PM
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id say either a bleed in the reverse input drum or in the reverse boost valve or pr valve in the pump. if 1st gear is ok, then thats where id look. is there a shudder at all in reverse? and have you hooked up a pressure gage?
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Old 05-20-2009, 07:06 PM
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No shudder in reverse. It just takes a little while to engage in reverse and then it will only move if I am on level ground or an incline where I roll backwards in reverse. What are the fixes for the items you listed? I have not yet put a pressure guage on it since I put it back in the truck.

Jay
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Old 05-20-2009, 07:54 PM
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take the check ball out of the capsul at the back end of the valve body,,.,

What did you set the pump rotor and slide clearance at?

Did you down size the bleed hole int he aluminum piston in the reverse input Drum?

Did you open the feed hole in the separator Plate to the low-reverse piston ?
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Old 05-21-2009, 10:41 AM
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"take the check ball out of the capsul at the back end of the valve body,,.,

What did you set the pump rotor and slide clearance at?

Did you down size the bleed hole int he aluminum piston in the reverse input Drum?

Did you open the feed hole in the separator Plate to the low-reverse piston ?"
Yesterday 06:06 PM

Is this checkball in the case of the valve body?

Rotor to pump clearance should be .0015"-.002" correct. What is slide clearance?

Did not down size bleed hole in reverse input piston

Which hole is feed hole for low reverse piston?

Thanks,

Jay
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