RanchWelder
Full Access Member
- Joined
- Jan 14, 2023
- Posts
- 637
- Reaction score
- 925
- Location
- Earth
- First Name
- --------
- Truck Year
- 87
- Truck Model
- Blazer
- Engine Size
- 355ci
700R4 Information Thread
- Thread starter NickTransmissions
- 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.
Ricko1966
Full Access Member
- Joined
- Apr 11, 2017
- Posts
- 4,121
- Reaction score
- 5,983
- Location
- kansas
- First Name
- Rick
- Truck Year
- 1975
- Truck Model
- c20
- Engine Size
- 350
I have a question does anyone know what valve body mods are needed to make a constant pressure throttle body for a 700r4? TCI used to offer one,but no more, now you have to buy their transmission to get one. The idea here was the valve body pressure would never drop below a certain pressure idrc the psi. Anyway even with a misadjusted TV cable pressure was never low enough to hurt the transmission. I'd be interested in building one. I see them on ebay,but TCI no longer offers them,which leads me to believe these are home made modifications. I don't particularly trust ebayers to sell me modified parts.
Last edited:
- Joined
- Aug 3, 2023
- Posts
- 278
- Reaction score
- 589
- Location
- Las Vegas
- First Name
- Nick
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 350
You basically have to block the TV Boost valve so it's wide open and same with the TV limit valve. You also need to modify the reverse boost valve to avoid a severe overpressure condition when in Reverse. I think I have some instructions Chris at CK gave me a few years ago so if I can dig them up, will post them here.
That said, I wouldn't do a CP VB for street use - that much pressure is generally harmful for the pump. If it's race only, it's good to go since trans periodically comes out for refresh in racing applications.
Ricko1966
Full Access Member
- Joined
- Apr 11, 2017
- Posts
- 4,121
- Reaction score
- 5,983
- Location
- kansas
- First Name
- Rick
- Truck Year
- 1975
- Truck Model
- c20
- Engine Size
- 350
OK now what if I made restrctors instead of complete blocking so I raise minimum pressure but still have ability for pressure rise?
Last edited:
- Joined
- Aug 3, 2023
- Posts
- 278
- Reaction score
- 589
- Location
- Las Vegas
- First Name
- Nick
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 350
I imagine that could be possible, if you wanted to either make different size restrictors to achieve a certain pressure 'floor' which can be adjusted by either swapping out different restrictors or making an 'adjustable' restrictor...You'll have experiment and test...I'll look into it also and see what can be done.
- Joined
- Aug 3, 2023
- Posts
- 278
- Reaction score
- 589
- Location
- Las Vegas
- First Name
- Nick
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 350
I actually set one up for a 200-4R recently so the 700R4 isn't all that different and I imagine will involve the same or very similar steps.
Scott91370
Full Access Member
- Joined
- Apr 2, 2018
- Posts
- 933
- Reaction score
- 904
- Location
- Burleson, Tx
- First Name
- Scott
- Truck Year
- 1985
- Truck Model
- Sierra1500
- Engine Size
- 350
This would be great. I've got mine adjusted pretty good but still not 100% happy with it. I set it up match several articles that said what RPM/Speed it should shift at when at partial throttle but I can't get it to downshift right when I go to full throttle. It's usually not a problem since it's just a cruiser but I sure don't want to kill a good transmission.
RanchWelder
Full Access Member
- Joined
- Jan 14, 2023
- Posts
- 637
- Reaction score
- 925
- Location
- Earth
- First Name
- --------
- Truck Year
- 87
- Truck Model
- Blazer
- Engine Size
- 355ci
Adjustable restrictor?
Itali83
Full Access Member
- Joined
- Feb 7, 2015
- Posts
- 575
- Reaction score
- 1,078
- Location
- Maine
- First Name
- Ben
- Truck Year
- 1982, 1987, 1987
- Truck Model
- K10, 'burban C10, Jimmy
- Engine Size
- 350, 6.2, 350
Can you guys tell me what the differences between a gas job 700 and diesel 700 are? I’m going to put a 6.2 diesel in front of one of my known good running 700’s that was behind a 350. I know the converter will be different. But are the governor weights different to lower shift points? Part numbers or a source to just buy everything in one spot would be greatly appreciated. Thank you.
Ben
Ben
- Joined
- Aug 3, 2023
- Posts
- 278
- Reaction score
- 589
- Location
- Las Vegas
- First Name
- Nick
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 350
Governor is the primary difference. The valve bodies themselves are the same between gas and diesel applications...200-4Rs by contrast, use different governors, valve bodies and 1-2 accumulator housings (in case anyone was wondering, lol).
Itali83
Full Access Member
- Joined
- Feb 7, 2015
- Posts
- 575
- Reaction score
- 1,078
- Location
- Maine
- First Name
- Ben
- Truck Year
- 1982, 1987, 1987
- Truck Model
- K10, 'burban C10, Jimmy
- Engine Size
- 350, 6.2, 350
Do you have a source for the governor? I’ve done searches online and it always gets off track to billet converters for duramax etc etc.
Ben
- Joined
- Aug 3, 2023
- Posts
- 278
- Reaction score
- 589
- Location
- Las Vegas
- First Name
- Nick
- Truck Year
- 1987
- Truck Model
- R10
- Engine Size
- 350
Buy the Superior Tech governor kit. Should have what you need to adapt your gov for diesel
Similar threads
