How do I keep my 4R70W cool?
06-29-2009, 08:20 PM
#12
2nd Gear Member
Thread Starter
Join Date: Jul 2007
Location: GA
Posts: 187
06-29-2009, 11:52 PM
#13
Thats your problem. Those shift kits operate very differently than the J-mod (which is INFINITLY better than the kit you bought). A side effect of the kit you bought is a DRASTIC increase in fluid temp.
When I had my built 4v GT w/ the 4R70W (J-mod and 3200 stall), I used Amsoil Syn Trans Fuild, B&M Hi-Tek Supercool Oversized w/ stainless steel braided lines (+~3.25 quarts), and B&M Cast Aluminum Deep Trans Pan (+3 quarts) and pushing 425hp at the crank and 4.10s out back, my trans temp NEVER broke the 140 degree mark even after auto-crossing it.
06-30-2009, 07:28 AM
#14
5th Gear Member
Join Date: Mar 2008
Location: Ohio
Posts: 2,994
Thats your problem. Those shift kits operate very differently than the J-mod (which is INFINITLY better than the kit you bought). A side effect of the kit you bought is a DRASTIC increase in fluid temp.
When I had my built 4v GT w/ the 4R70W (J-mod and 3200 stall), I used Amsoil Syn Trans Fuild, B&M Hi-Tek Supercool Oversized w/ stainless steel braided lines (+~3.25 quarts), and B&M Cast Aluminum Deep Trans Pan (+3 quarts) and pushing 425hp at the crank and 4.10s out back, my trans temp NEVER broke the 140 degree mark even after auto-crossing it.
When I had my built 4v GT w/ the 4R70W (J-mod and 3200 stall), I used Amsoil Syn Trans Fuild, B&M Hi-Tek Supercool Oversized w/ stainless steel braided lines (+~3.25 quarts), and B&M Cast Aluminum Deep Trans Pan (+3 quarts) and pushing 425hp at the crank and 4.10s out back, my trans temp NEVER broke the 140 degree mark even after auto-crossing it.
He had no cooling issues.
06-30-2009, 12:41 PM
#16
1st Gear Member
Join Date: Sep 2007
Location: Missouri
Posts: 82
As far as an alternate mounting location goes, I mounted mine flat on the bottom of the car on the passenger side of the exhaust, right next to the bellhousing of the tranny. I mounted it with the front angled up slightly so it would catch as much incoming air as possible without sacrificing any ground clearance. I have a 3200 stall, and that setup has kept the tranny cool, even during extended periods of hard driving.
06-30-2009, 01:23 PM
#17
The j-mod works by drilling in holes in the separator plate and removing a few spring assists and swapping accumulators out, if required. It allows more fluid to flow through the valve body and trans, thus firming up the shift, cooling the fluid (by allowing more fluid to flow, it allows for better transfer of the heat), removing the slip between "gears", doesn't increase pressure in the trans and valve body, and thus increasing the life of the transmission greatly.
Shift kits work at the cost of increasing global line pressure, amongst other things like taking out or adding spacers, springs, etc to achieve the same results. Increased pressure generally equals lower transmission life and always equal increase temp.
It has been said that doing it the j-mod way is safer for long term reliability vs the shift kits that mess just with the pressure...however many people report no problems using either method (except increased temp with shift kit) to gain a firmer and quicker shift.
And yes, VAP is still doing the j-mod. You can send in your valve body and they'll do the j-mod and send it back to you.
http://www.vapauto.com/jmod.htm
Shift kits work at the cost of increasing global line pressure, amongst other things like taking out or adding spacers, springs, etc to achieve the same results. Increased pressure generally equals lower transmission life and always equal increase temp.
It has been said that doing it the j-mod way is safer for long term reliability vs the shift kits that mess just with the pressure...however many people report no problems using either method (except increased temp with shift kit) to gain a firmer and quicker shift.
And yes, VAP is still doing the j-mod. You can send in your valve body and they'll do the j-mod and send it back to you.
http://www.vapauto.com/jmod.htm
06-30-2009, 04:58 PM
#18
2nd Gear Member
Thread Starter
Join Date: Jul 2007
Location: GA
Posts: 187
As far as an alternate mounting location goes, I mounted mine flat on the bottom of the car on the passenger side of the exhaust, right next to the bellhousing of the tranny. I mounted it with the front angled up slightly so it would catch as much incoming air as possible without sacrificing any ground clearance. I have a 3200 stall, and that setup has kept the tranny cool, even during extended periods of hard driving.
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