700R4 Question
Thread Starter
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
700R4 Question
Anybody installed the "deluxe" 13 vane pump upgrade in their 700R4??
I was wondering what performance gains/changes it provides?
I see it advertised, but can't find any feature/benefit descriptions for it.
http://www.transmissionpartsusa.com
#35764CDK
I was wondering what performance gains/changes it provides?
I see it advertised, but can't find any feature/benefit descriptions for it.
http://www.transmissionpartsusa.com
#35764CDK
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
i did not put this in my 700r4 but i guess it either helps in cooling the fluid or it increases the flow or pressure somehow...
8th Gear
Joined: Oct 2005
Posts: 8
Likes: 0
a few years ago my 700r4 lost 3rd gear. went from 2nd to neutral, sorda. i took it in to have it rebuilt and the tranny guy told me that this was a common problem with the r4's. he also said that the pump vane in the rebuild kit had more vanes, 13 maybe i don't remember, but more than the original. the explanation was that it would assist in cooling the transmission. i am thinking that all the rebuild kits are coming with the "new" pump vane.
Drifting
Joined: Mar 2004
Posts: 1,873
Likes: 1
From: Savannah Ga
The 82/84 early 700R4's had some reliabilty issues.In the next couple of years GM rectified this by beefing up the trans.This was more than likley one of the areas that got attention.I found this out by the guy I bought my 82CE from.He had the trans pulled and rebuilt useing the service replacements parts.He also had them put in a shift kit at the same time.I've had no problems 
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
The 13 vane pumps reduce cavitation at high rpms. They work like a paddlewheel. More paddles = smoother flow. The aftermarket 13 vane pumps have questional durability. They are known to fracture(explode) from time to time. I have not had one of these failures, but have heard about then 2nd hand. I have since reverted back to 10 vane gm pumps in the units I assemble.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Originally Posted by sparky8591
a few years ago my 700r4 lost 3rd gear. went from 2nd to neutral, sorda. i took it in to have it rebuilt and the tranny guy told me that this was a common problem with the r4's. he also said that the pump vane in the rebuild kit had more vanes, 13 maybe i don't remember, but more than the original. the explanation was that it would assist in cooling the transmission. i am thinking that all the rebuild kits are coming with the "new" pump vane.
