A few auto transmission questions

saber63 · July 14th, 2010, 11:08 PM

Alright, so i know the first that needs to be done is a transmission cooler.

after that i understand there are a few tweaks and mods that can be done to improve shifting and increase ability to hold power while staying in one piece

however i seem to be finding some mixed info.

what i would like to know is if on the 1999 4R70W auto transmissions, is the Jerrry mod, or JMOD, still worth doing?

the how to link i found is here.

TCCoA Tech Articles

is for a older(1997) transmissions. are there other suggested drill sizes to use etc...?

also are there any other modifications that can be done with the use of a drill press and replacement gaskets and parts?

i would enjoy doing the mods myself then simply buying a shift kit, however if there is a kit that just has things like springs and gaskets, that still have you do the drilling, that'd be great!

also i should note that the end goal(not for awhile

) for the car is 300-400HP (turbo, maybe built guts etc...) so i would rather do most the mods to the tranny while im in there

Thanks all for the help!

-levi

p.s. searching yielded me the posted link, as well as confusion

3.8mustang98 · July 21st, 2010, 08:03 PM

I installed a B&M Shift kit formy '98 4R70W. I had to drill some holes, replacing springs, and other little stuff. I like it a lot, a lot more responsive shifts. (I can break the rear tire loose going into 2nd). I have put about 6,000 miles on it since it was installed and no problems.

Matt. · July 21st, 2010, 08:55 PM

You might want to think about a highstall tc, just a thought while your figuring out your transmission goals.

saber63 · July 22nd, 2010, 01:28 AM

Thanks for the info! im still debating on the shift kit Vs the mod....

as for the highstall TC thats just for better launches right? id probably pass as it wont be a drag car... more of twistys and road course toy.

would still like to hear more info about the J-MOD...

-levi

plak424 · July 22nd, 2010, 08:49 PM

check out trans-go shift kits as well, I did a lot of research a while ago on different kits and the j-mod, and trans go looked the best

Matt. · July 22nd, 2010, 09:36 PM

Originally Posted by saber63

Thanks for the info! im still debating on the shift kit Vs the mod....

as for the highstall TC thats just for better launches right? id probably pass as it wont be a drag car... more of twistys and road course toy.

would still like to hear more info about the J-MOD...

-levi

Get an sct tuner to ajust shift points and firm up shifts. You will need this becuase since the auto shifts you wont be in the greatest gear for turns. fthere might be a way to tune it so it downshifts easyer when you let off the gas so you can be in a better gear for turns. Just my .02

EddieJr93 · August 24th, 2010, 01:17 AM

YouTube - 96 GT + 4.10's + J mod = lots of spinning

July 14th, 2010, 11:08 PM	#1
saber63 Newbie 1999 V6 mustang Join Date: Jul 2010 Location: Seattle Posts: 28 iTrader: 0 reviews	A few auto transmission questions Alright, so i know the first that needs to be done is a transmission cooler. after that i understand there are a few tweaks and mods that can be done to improve shifting and increase ability to hold power while staying in one piece however i seem to be finding some mixed info. what i would like to know is if on the 1999 4R70W auto transmissions, is the Jerrry mod, or JMOD, still worth doing? the how to link i found is here. TCCoA Tech Articles is for a older(1997) transmissions. are there other suggested drill sizes to use etc...? also are there any other modifications that can be done with the use of a drill press and replacement gaskets and parts? i would enjoy doing the mods myself then simply buying a shift kit, however if there is a kit that just has things like springs and gaskets, that still have you do the drilling, that'd be great! also i should note that the end goal(not for awhile ) for the car is 300-400HP (turbo, maybe built guts etc...) so i would rather do most the mods to the tranny while im in there Thanks all for the help! -levi p.s. searching yielded me the posted link, as well as confusion

July 21st, 2010, 08:55 PM	#3
Matt. Hardcore Enthusiast 2002 Nitrous Injected V6 12's? Join Date: Oct 2009 Location: Chester County, PA Posts: 2,414 iTrader: 0 reviews	You might want to think about a highstall tc, just a thought while your figuring out your transmission goals. __________________ Project Red Magic -Full Intake, Full Exhuast,Geared, Tune, Sprayed, Dropped- -18 Inch Hypercoated Saleens wrapped in Nittos-

July 22nd, 2010, 08:49 PM	#5
plak424 Regular 2000 Mustang v6 16.683@83.86 Join Date: Feb 2010 Location: CT Posts: 344 iTrader: 0 reviews	check out trans-go shift kits as well, I did a lot of research a while ago on different kits and the j-mod, and trans go looked the best __________________ A turbo, exhaust gasses go into the turbocharger and spin it, with a supercharger, air goes in,witchcraft happens and you go faster~Jeremy Clarkson

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July 21st, 2010, 08:03 PM	#2
3.8mustang98 Newbie 1998 Mustang 3.8 Join Date: Jul 2010 Location: St. Louis Posts: 26 iTrader: 0 reviews	I installed a B&M Shift kit formy '98 4R70W. I had to drill some holes, replacing springs, and other little stuff. I like it a lot, a lot more responsive shifts. (I can break the rear tire loose going into 2nd). I have put about 6,000 miles on it since it was installed and no problems.

July 22nd, 2010, 01:28 AM	#4
saber63 Newbie 1999 V6 mustang Join Date: Jul 2010 Location: Seattle Posts: 28 iTrader: 0 reviews	Thanks for the info! im still debating on the shift kit Vs the mod.... as for the highstall TC thats just for better launches right? id probably pass as it wont be a drag car... more of twistys and road course toy. would still like to hear more info about the J-MOD... -levi

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