RE: [Chevelle-list] Trans cooler

Wed, 30 Jul 2003 14:38:37 -0700

Title: Trans cooler
My 468 TH700R4 approx 3.30 rear gets 11 or 12 mpg on the interstate in OD.  I was hoping for mid teens. 
 
Clint, what kind of carb do you have on the 68 Elky?
 
Mark
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Clint Hooper
Sent: Tuesday, July 29, 2003 4:12 PM
To: [EMAIL PROTECTED]
Subject: Re: [Chevelle-list] Trans cooler

I ran just a big auxiliary cooler on my 40 F*rd coupe streetrod with built L98 engine,TH350 trans,and Halibrand QC rear. Ran the car that way for over six years without any problems. Not convinced you need to change the radiator.
 The trans builder's credibility took a big hit when he said you wouldn't see a difference in fuel mileage with an OD trans. BS. My 91 Chevy 1/2 ton truck will get 15mpg on the road using Drive only. Using 4th,it will get 20mpg. My former 68 Elky with 468"BB went from 10mpg to almost 16mpg after I installed the 700R4. My present 69 Elky went from 16mpg to over 20mpg when I swapped out the 4spd for the 6spd.
----- Original Message -----
 

I spoke with a guy tonight about building a 200-4R and he said something that kind of surprised me.  Even if you run an auxiliary trans cooler, you should still run through the radiator connections as this helps to warm up the trans fluid to help the seals.  If you start anew on a cool day (60º was his example), it takes the trans too long to warm up via just the auxiliary cooler.  Anyone hear of something like this?  What should minimum trans temp be?  I think 200º is on the high end, but what's low and what's optimum?

I'm getting antsy to swap my M20 4-speed setup for a 200-4R but don't have a trans cooler in the radiator.  I bought a B&M 24,000 GVW Super Cooler unit and now I'm told it won't warm up the trans fast enough?

He also said that the O/D won't improve mileage to any degree.  Somehow I think reducing RPM's from 3000 or so at 75/80 to 2000 or so has to improve mileage - am I wrong here?  Currently I'm running 2100 at 55mph.  I find it hard to believe that I'm not using more fuel at 3000 RPM (75/80 MPH) than I am at 2100 (55 MPH).  With the O/D, I can run the same 75/80 MPH at my current 55 MPH RPMs.

Dale McIntosh
TC Gold #92/ACES #1709/NECOA #41
67SS/67 Elky
Dale’s Place – My 67 SS and 67 El Camino
ChevelleStuff – Decoding info on 64-72 Chevelles
Team 67 – 1967 Chevelle/El Camino Specific
Midwest Chevelles – Midwest Chevelle Show Information


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