Performance 700r4 rebuild
- Thread starter Wumbo
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Checked pump clearances.
New rotor .015, new slide less than .015. Surface finish on both sides is ugly. Somebody resurfaced them on a mill with a worn out cutter. I'll be chucking them up in the lathe to get a better surface finish, and get clearances in spec.
Drainback circuit was wonky. .250" from the front bushing pocket, .3125 on the rear of the cover, then .225 through the pump body.
Not performance related, but I drilled the passage through the pump body to .281 and will chamfer the hole so it makes a clean transition after I refinish the pump surface.
New rotor .015, new slide less than .015. Surface finish on both sides is ugly. Somebody resurfaced them on a mill with a worn out cutter. I'll be chucking them up in the lathe to get a better surface finish, and get clearances in spec.
Drainback circuit was wonky. .250" from the front bushing pocket, .3125 on the rear of the cover, then .225 through the pump body.
Not performance related, but I drilled the passage through the pump body to .281 and will chamfer the hole so it makes a clean transition after I refinish the pump surface.
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Oddittitties in the pump.
PR valve. No TV or reverse boost. Just the valve, spring, andaluminum plug. Edit- 4L60E boost assembly sleeve.
Flats ground on the TCC valve
PR valve. No TV or reverse boost. Just the valve, spring, and
You must be registered for see images attach
You must be registered for see images attach
Flats ground on the TCC valve
You must be registered for see images attach
Last edited:
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Resurfaced pump, pressed out stator support, and checked pump clearance. Pump rotor and slide came in at .0018 after machining the pump.
Waiting for new Sonnax stator support to show up.
Waiting for new Sonnax stator support to show up.
You must be registered for see images attach
Nasty-LSX
TogetherforeverCovid19
- Joined
- Nov 22, 2014
- Posts
- 1,395
- Reaction score
- 1,737
- Location
- HOUSTON TX
- First Name
- Mi Hung Lo
- Truck Year
- 85/86/87
- Truck Model
- c10/k10/k20
- Engine Size
- LSX
Awesomeness!!
Nasty-LSX
TogetherforeverCovid19
- Joined
- Nov 22, 2014
- Posts
- 1,395
- Reaction score
- 1,737
- Location
- HOUSTON TX
- First Name
- Mi Hung Lo
- Truck Year
- 85/86/87
- Truck Model
- c10/k10/k20
- Engine Size
- LSX
GEEEEZ
- Joined
- Aug 3, 2023
- Posts
- 412
- Reaction score
- 851
- Location
- Las Vegas
- First Name
- Nick
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 350
You must be registered for see images attach
That sucks, man - sorry to see...i had a similar situation a month ago - found out the stator support was warped. Had to cannibalize another 700R4 core to put that pump back together.
DoubleDingo
Full Access Member
- Joined
- Jul 3, 2012
- Posts
- 11,250
- Reaction score
- 17,176
- Location
- Right where I am
- First Name
- Bagoomba
- Truck Year
- 1981
- Truck Model
- 81-C20 Silverado Camper Special-TH400-4.10s
- Engine Size
- Carb'ed Vortec 350
That sucks!
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Anyone know if TCI marks their constant pressure valve bodies in any way?
They use the same pressure regulator setup as what I had in this pump.
They use the same pressure regulator setup as what I had in this pump.
You must be registered for see images attach
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Moving forward. I'll come back to the pump and valve body.
Case prep is finished. Installed new seals on the low reverse piston and installed it in the case.
5 pinion rear planet from 4l65e
Replaced low reverse wave with 2 steels.
Installed the clutch pack and low roller assembly, then did an air check.
Case prep is finished. Installed new seals on the low reverse piston and installed it in the case.
5 pinion rear planet from 4l65e
You must be registered for see images attach
Replaced low reverse wave with 2 steels.
Installed the clutch pack and low roller assembly, then did an air check.
You must be registered for see images attach
Last edited:
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Sonnax smart shell and 5 pin forward
Drums and band in there
Getting this guy fitted now
You must be registered for see images attach
Drums and band in there
You must be registered for see images attach
Getting this guy fitted now
You must be registered for see images attach
- Joined
- Dec 7, 2010
- Posts
- 24,772
- Reaction score
- 6,635
- Location
- Southeast PA
- First Name
- Paw Paw
- Truck Year
- 2007
- Truck Model
- Chevrolet Tahoe LT
- Engine Size
- 5.3, 4WD
Sub'd for coolness. 
Wumbo
Full Access Member
- Joined
- Dec 12, 2018
- Posts
- 1,084
- Reaction score
- 3,997
- Location
- Illinois
- First Name
- Rob
- Truck Year
- 1986
- Truck Model
- C20
- Engine Size
- 454
Bought a rebuilt pump from ebay. Met expectations (they weren't that high).
New rings, seals, and bushings. Used rotor, vanes, and (7 vane) slide.
Teflon coated bushing is good
Pump body and cover had some wear. Would have been ok in a stock build I'm sure, but I took them to the lathe and did a cleanup pass.
Installed new rotor and slide, vanes, pin, and unbreakable rings.
New rings, seals, and bushings. Used rotor, vanes, and (7 vane) slide.
You must be registered for see images attach
Teflon coated bushing is good
You must be registered for see images attach
Pump body and cover had some wear. Would have been ok in a stock build I'm sure, but I took them to the lathe and did a cleanup pass.
Installed new rotor and slide, vanes, pin, and unbreakable rings.
You must be registered for see images attach
Last edited:
