I am also building a '70 vert with a ZZ502. For this project, we were originally going to go with a 700R4, but found that the 700R4 tops out at around 450 ft-lbs of torque. My understanding is that the weak link is the Aluminum input shaft. We decided to switch gears (no pun intended) and went with the TH400/GV setup.
However one final note....There are companies that are addressing the 700R4 limitations. Bow Tie Overdrives in SoCal has a modified 700R4 that will handle up to 600HP. I've already headed down the TH400/GV path, but it might be worth looking into what you can get from a 700R4 these days.
For more 700R4 info :
http://www.700r4.com/
For more Gear Vendors info :
http://www.gearvendors.com/
At 11:40 AM 12/4/2002 -0600, jlon5 wrote:
Thanks for the feedback Tom, I will definitely look into the Gear Venders unit. John L. 70 SS454 ACES #5597 ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, December 04, 2002 10:54 AM Subject: Re: [Chevelle-List] Gearvenders under/over verses 700R4In a message dated 12/4/02 9:26:15 AM Eastern Standard Time, [EMAIL PROTECTED] writes: << Anyone have any opinions on Gearvenders under/over drive verses a 700R4 tranny swap. I currently have a TH400 driving a 3.73 12 bolt posi and the revs are way to steep for long highway cruisin', 3000 @ 60 mph. Would like to drop them down to around 2000 @ 60 without swapping out rearend. >> I run my 70 down to Maryland quite often. It has a 4.10 12 bolt and cranks out 3700 RPMs at 80 mph. I usually keep it there for the duration of the trip down I-95 and 301 South. It gets awesome gas mileage at that (15 mpg). Best bet is probably to go with a Gear Vendors Unit. Not cheap, but well worth it as you get 6 forward gears instead of 4 with a 700R4. Tom ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED] ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
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