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In order to increase only the 2-3 shift you will need to increase the spring tension on the 2-3 shift valve spring. I used to know the formula to calculate how much MPH a certain increase in tension would produce, but I can't remember. A very slight increase in spring tension will raise the...

I stand corrected on the sealing ring. Chris is absolutely correct about the overrun housing bushing being a pain in the butt to replace.

Just make sure the sealing rings on the input shaft are OK. The solid ring goes into the overrun clutch housing. Replace the bushing in the overrun housing also. If you want a firmer converter clutch engagement you can remove the check ball and capsule.

Just finished testing a forward shift pattern valve body for the 200-4R. This valve body will give you complete control of your shift points.

Is the TCI valve body plate red? Are you installing a Trans-Scat kit # 386000? If the plate is red the holes are not drilled. With whom did you talk with at TCI? Thanks, Bob

You definitely need to remove the l/r piston and clean the case very well. I would disassemble everything and clean all the parts. Check the pump bushing and replace the pump seal. Most importantly clean your transmission cooler or bypass it with a new auxiliary cooler or this might happen again.

The hole sizes are not critical. The tcc signal hole only needs to feed the tcc valve in the pump cover as I stated before. A 1/16" hole will supply plenty of oil to the tcc valve. Drilling the 1-2 accumulator hole only 1/16" will make the shift firmer with out being too harsh. Drilling the...

That valve body plate does not have the hole pre-drilled for the 1-2 accumulator either. So, if you don't drill the hole you can leave the piston and spring out. I would suggest leaving the spring and piston in, so they won't get lost just in case the 1-2 shift is too rough for you. You can...

Is the hole you are referring to the tcc signal hole or the 1-2 accumulator hole? Well, 1/16" will work for either hole. The tcc signal feeds the tcc valve in the pump cover. If you wish to leave the 1-2 accumulator functional, leave the piston and spring in the housing and drill the 1/16" hole...

Yes, you can press out the the shaft and install it into another housing. There is a master spline which must be lined up correctly. Be sure to support the inside of the housing when pressing the shaft into it or you will break the center out of the housing. Sonnax sells the support ring and...

We've experienced some rebuilt pumps which produced a knocking noise. The cause was an off center condition of the drive gear in relation to the crest. All pumps work anytime the engine is running, with the exception of a rear pump.

Any time there is a hard part failure is this transmission, the valve body should be disassembled and thoroughly cleaned. Sounds like the throttle valve is sticking.

I can think of three possibilities: broken intermediate shaft torque converter broken pump rotor

Just in, TCI's cooler line fittings for '97-up 4L80E transmission. There will also be a part number for two short fittings for late 350, 400, 200-4R, 700R4, 4L60E, and '91-'96 4L80E. Pricing will be announced soon.

YourCovers.com GM 200-4R Deep Transmission Pan

TCI and Bob Harrison

Check out these cool new paerts.

If you are satisfied with the other shifts, you raise the 1-2 shift only, by shimming the 1-2 shift valve spring. Thin shim washers work great for this modification. Transgo used to offer a spring scale for checking springs but I think it's been discontinued. Start out with one thin shim washer.

Geez.......... of course you can do things your way in your business. I'm just stating the fact, " if the overrun frictions aren't applied at launch, the input(overdrive roller clutch) is taking the shock load of coupling the input shaft to the forward clutch assembly. I meant no disrespect...

Chris, I didn'y say the 80E brake was the only one on the market. Why isn't yours on your web site or did I overlook it? Does yours utilize the overrun clutches in all gears except overdrive? I work for TCI and I designed the valve body along with the six speed valve body. Just letting...