The boost valve assembly is notorious for wear causing both low pressure as well as runaway boost pressure. With the low boost pressure problem, the resulting complaints are a soft shift, direct clutch failure as well as the gear ratio and solenoid performance codes.
On the other hand, the runaway boost pressure problem can result in a costly broken case, direct drum and piston failure. This TransGo Reprogramming Kit provides full manual control for upshifting and downshifting 1st through 4th gear, there are no automatic shift functions retained.
This kit delivers short firm shifts for performance as well as greater overall durability. Once activated, the transmission can be bumped up Terminal B or down Terminal C through the forward gears via an On-Off-On momentary rocker switch.
Caution: Be aware that serious engine damage could occur due to over-revving if downshifts are made at too high of vehicle speed. The TCU cannot override your input while in the manual mode. Good info in there Snot Rocket New Member. Will be keeping a eye on this one. For some reason I can't open the pdf file. Would be intersting to know if this bypasses the pressure valve and makes shifs at full line pressure. That would lower clutch pack slip, lower temp, and wear.
Snot Rocket said:. WarWagon Well it hits on 7 of Messages 10, Reaction score 6, Location AZ. Or did I just answer my own question. Got feedback about the OBDII programming where the possibility of ECM doing per-gear TCC lock-up as the Supermatic programming looks like it allows when using the gear selector might or might not work well as this pushes the creativity boundaries for programmers.
Recommendation was to beef up the brakes rather than try to use engine braking under 47 MPH and let the ghost go. Starting to think the best way to get the 4L80E to act like a stick is to drop in a stick. I have done the switches twice now. First with the old 93 manual pump truck. Employee had messed up when dropping last 6. Exhaust leak burnt up wiring which ran the 4L80E. It was an old work truck and I was stuck miles from home with trailer on. And got me home. Drove it for a year like that until last January when the motor chunked again.
Junked the truck to raise quick cash to buy a 98 5-speed truck! For the trans! Also had a good 6. The 5-speed is for the 01 gas convert that I drive every day. Thats right I have an 01 with an DB2, turboed 6.
The Stage 4 4L80E adds the billet intermediate shaft. Stage 4 builds are mainly for heavy vehicles, diesel, or large uses of N2O. We have put together the common parts used in most of these retrofits to make it easier for the customer to do so. Typically this is all you need to put the 4L80E into your muscle car aside from driveline shortening and crossmember mods or fabrication.
We will also offer tech support to help with the install. We have installed them in most of the early GM cars. This service includes all new frictions, steels, bands, shift solenoids, rebuild labor, and dyno time. It renews the warranty. It does not include the converter cut and clean, or hard parts. See our pricing table below for hard parts and upgrade costs. All 4L80 builds now have a core charge due to core shortages. These work well in big power drag racing combos that need to tame the launch.
These include the tailhousing with new bushing, seal, o-ring, speedometer gears calibrated for your combo, and driven speedo housing.
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