- Joined
- May 24, 2023
- Messages
- 41
1969 Chevrolet C10 pickup with a mostly stock 350 (Holley Sniper efi and GM HEI ignition, otherwise a stock 250hp engine. It has a 3.73 open rear end, and a 700R4 that slips when shifting from 2nd-3rd under moderate load.
Currently the truck is my son's college daily driver, but he's going to want to rebuild and upgrade the engine in a couple years, so we decided to build a moderately-stout 4L60E with a new stock Converter (for now) that will be able to handle future engine upgrades (not more than maybe 400-425hp, if he wants to go faster he needs a different vehicle)
Picked up a 96 4L60E from a '97 C1500 with 105K miles, was told it worked fine when pulled. We pulled the pan and found evidence of water / dirt ingress (likely via missing dipstick tube hole. We then tore it completely down, and found that while there had been water in the pan, the clutches and other internal parts (except the Reverse Drum which had rust and so was replaced) were fine and it looked like the transmission had recently been rebuilt - the frictions, sprag, gears, thrust bearings, etc all showed little to no wear. We are now in the middle of rebuilding it with these parts, using info from "clinebarger" online, the ATSG Manual, and the Sonnax / TransGo Shift Kit Instructions.
Got a couple questions, of course... @clinebarger if you could take a look at this I'd appreciate you input.
1. Separator Plate drilled orifice sizes? I got those from clinebarger's posts here, but now I'm thinking some of them are too big - comments?
2. We're using the Sonnax TCC isolator - regulator valve because it specifically claims to limit the converter apply pressure. But the TransGo TCC Isolator-Conv Regulator Valve claims to be better in a used Valve Body - but I can't find anything on it's limiting the converter apply pressure... So which is the better option?
3. I'm planning on blocking the 3-2 downshift valve inwards, unless in this application it's best to leave as is?
4. The total end play is within the ATSG specs, but I'm thinking it could be tighter - is it worth tightening it up?
5. Anything else I should address?
Currently the truck is my son's college daily driver, but he's going to want to rebuild and upgrade the engine in a couple years, so we decided to build a moderately-stout 4L60E with a new stock Converter (for now) that will be able to handle future engine upgrades (not more than maybe 400-425hp, if he wants to go faster he needs a different vehicle)
Picked up a 96 4L60E from a '97 C1500 with 105K miles, was told it worked fine when pulled. We pulled the pan and found evidence of water / dirt ingress (likely via missing dipstick tube hole. We then tore it completely down, and found that while there had been water in the pan, the clutches and other internal parts (except the Reverse Drum which had rust and so was replaced) were fine and it looked like the transmission had recently been rebuilt - the frictions, sprag, gears, thrust bearings, etc all showed little to no wear. We are now in the middle of rebuilding it with these parts, using info from "clinebarger" online, the ATSG Manual, and the Sonnax / TransGo Shift Kit Instructions.
Got a couple questions, of course... @clinebarger if you could take a look at this I'd appreciate you input.
1. Separator Plate drilled orifice sizes? I got those from clinebarger's posts here, but now I'm thinking some of them are too big - comments?
2. We're using the Sonnax TCC isolator - regulator valve because it specifically claims to limit the converter apply pressure. But the TransGo TCC Isolator-Conv Regulator Valve claims to be better in a used Valve Body - but I can't find anything on it's limiting the converter apply pressure... So which is the better option?
3. I'm planning on blocking the 3-2 downshift valve inwards, unless in this application it's best to leave as is?
4. The total end play is within the ATSG specs, but I'm thinking it could be tighter - is it worth tightening it up?
5. Anything else I should address?
Group | Brand | Parts | Specs | Source |
Accumulator Mod | TransGo | 1-2 Accumulator Spring from kit, based on 093 piston and DX bushing | White | TransGo |
Accumulators Parts | GM | 1-2 Accumulator Housing and plastic piston, part #24226359 (supercedes GM24227711) | Amazon | |
Accumulators Parts | GM | 1-2 Outer Cushion Spring, part #24209794 | Summit | |
Accumulators Parts | GM | 3-4 Accumulator Spring | Core | |
Accumulators Parts | Sonnax | 3rd Accumlator Checkball Capsule | Amazon | |
Accumulators Parts | Sonnax | 3-4 Accumulator Pinless Piston Kit | HP-4L60E-01 | |
Accumulators Parts | Sonnax | Forward Accumulator Piston with OE Spring | HP-4L60E-01 | |
Accumulators Parts | Sonnax | Forward Accumulator Spring | HP-4L60E-01 | |
Clutches / Internal Parts | Alto | Kolene (nitrided) Clutch Steels, all, kit # | Ebay | |
Clutches / Internal Parts | Borg Warner | HE Frictions, all | Ebay | |
Clutches / Internal Parts | Durabond | Seamless PTFE-coated Bushings | Summit | |
Clutches / Internal Parts | GM | Reverse Input Drum / Housing, part# 24245624 | Amazon | |
Clutches / Internal Parts | GM | 3-4 Clutch Apply and Backing Plates | Core | |
Clutches / Internal Parts | GM | 3-4 Clutch booster springs | Core | |
Clutches / Internal Parts | Sonnax | Sonnax Wider, PTFE Rear Stator Support Bushing, Part No. 77002BT-01 | Durabond Kit | |
Clutches / Internal Parts | Sonnax | Sonnax SmartShell Heavy Duty Reaction Shell Kit, Part No. 77749-02K | Summit | |
Clutches / Internal Parts | WIT | Hi-perf Blue Apply Pistons, all | Amazon | |
Clutches / Internal Parts | Low-Reverse Clutch Height | 1.220 | ATSG | |
Clutches / Internal Parts | Forward Clutch Clearance | 0.045 | ATSG | |
Clutches / Internal Parts | 3-4 Clutch Clearance | 0.065 | ATSG | |
Clutches / Internal Parts | Reverse Input Clutch Clearance | 0.045 | ATSG | |
Clutches / Internals | Total End Play before and after rebuild | 0.030 | ATSG | |
Electrical Parts: | Wiring Harness and TCC Solenoid | Amazon | ||
Electrical Parts: | 5-piece New Solenoid Kit | Amazon | ||
Electrical Parts: | Pressure and Temp Switches / Sensor | Amazon | ||
Gaskets and Seals: | Transtec | Gasket / Seal Kit (gotta love the lip seal installer tool!) | Amazon | |
Pump: | GM | Pump Vanes | Core | |
Pump: | Sonnax | Boost Valve with O-Ring .490" | HP-4L60E-01 | |
Pump: | Sonnax | Elevated Pressure Regulator Spring | HP-4L60E-01 | |
Pump: | TransGo | Hardened Pump Rings and Hi-Rev Spring, part# 700RK | Summit | |
Pump: | Rotor and Slide Clearance | 0.001 | clinebarger | |
Separator Plate Mods | Drilled Hole A (3-2 shift) = .101 | 0.101 | Clinebarger | |
Separator Plate Mods | Drilled Hole B (2nd Clutch) = .076 | 0.076 | Clinebarger | |
Separator Plate Mods | Drilled Hole C (3rd Clutch) = .139 | 0.139 | Clinebarger | |
Separator Plate Mods | Drilled Hole D (4th Clutch) = .093 | 0.093 | Clinebarger | |
Separator Plate Mods | Drilled Hole E (AFL Balance oil) = .052 | 0.052 | Clinebarger | |
Separator Plate Mods | Plugged PWM Hole according to Sonnax TCC instructions | HP-4L60E-01 | ||
Separator Plate Parts | TransGo | Separator Plate, part #46-PLT-96 | Summit | |
Servos / Band Mods | TransGo | added Servo Cushion Springs | Blue and Black | |
Servos / Band Mods | TransGo | 4 notches ground into Servo Steel Cover | ||
Servos / Band Parts | GM | 2nd Apply Piston, 093 'Corvette' | Amazon | |
Servos / Band Parts | GM | Servo Cushion Spring | OEM | Core |
Servos / Band Parts | Raybestos | Pro-Series wide band, Part #RPS77765 | Amazon | |
Servos / Band Parts | Sonnax | SuperHold 4th apply piston, part of kit# 77767K | Amazon | |
Servos / Band Parts | Sonnax | Servo Release Check Valve (helps with 2-3 shifts and band release) | HP-4L60E-01 | |
Servos / Band Parts | Sonnax | Extra-long Band Apply Pin, part# 77787-02K | .076 clearance | Summit |
Skift Kits: | Sonnax | Performance Pack, Part No. HP-4L60E-01 | Amazon | |
Skift Kits: | TransGo | SK4L60E series L (1993-2002) | Summit | |
Valve Body Mod | "Special Pin" for Accumulator Bushing, allowing easier changes | TransGo | ||
Valve Body Mod | Installed yellow spring on Low Overrun Valve | Yellow | TransGo | |
Valve Body Parts: | Sonnax | Sonnax Heavy Duty 2-3 Shift Valve Part, No. 77754-41 | Amazon | |
Valve Body Parts: | Sonnax | TCC Pressure Limiter Valve & Spring (eliminates PWM/EC3 function) | HP-4L60E-01 | |
Valve Body Parts: | Sonnax | Pinless Forward Accumulator Piston | HP-4L60E-01 | |
Valve Body Parts: | Sonnax | Plastic (Delrin?) Checkballs (8) | HP-4L60E-01 | |
Last edited by a moderator: