4L60E vs TH400
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Teching In
Joined: Sep 2019
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4L60E vs TH400 Hi,
what gearbox would be the best choice for an lm7 with summit stage 3 truck cam and 243 heads? Its going in to an impala 65. What do I need to do to get the th400 on there? This adapter ring and nothing more? Thanks.
BTW, do I need a high stall converter? Im not gonna race it.
what gearbox would be the best choice for an lm7 with summit stage 3 truck cam and 243 heads? Its going in to an impala 65. What do I need to do to get the th400 on there? This adapter ring and nothing more? Thanks.
BTW, do I need a high stall converter? Im not gonna race it.
TECH Fanatic
Joined: Dec 2017
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From: Bossier City, Louisiana
Your post is unclear. Do you want to keep the 4L60E or put a TH400 in? You will need to edit the operating system to remove the 4L60E from the OS to prevent a phantom trouble code and Check Engine Light if you go with the TH400. No need for a high stall torque converter because it will be annoying in street driving and might contribute to transmission overheating.
Mostly street or highway driving? I have 2.73 gears in my 70 El Camino and I stick with a manually shifted D3 gear around town to keep the RPM's up a little and not load down the engine. I only do OD in my 4L60E on the interstate highway.
Rick
Mostly street or highway driving? I have 2.73 gears in my 70 El Camino and I stick with a manually shifted D3 gear around town to keep the RPM's up a little and not load down the engine. I only do OD in my 4L60E on the interstate highway.
Rick
Thread Starter
Teching In
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Your post is unclear. Do you want to keep the 4L60E or put a TH400 in? You will need to edit the operating system to remove the 4L60E from the OS to prevent a phantom trouble code and Check Engine Light if you go with the TH400. No need for a high stall torque converter because it will be annoying in street driving and might contribute to transmission overheating.
Mostly street or highway driving? I have 2.73 gears in my 70 El Camino and I stick with a manually shifted D3 gear around town to keep the RPM's up a little and not load down the engine. I only do OD in my 4L60E on the interstate highway.
Rick
Mostly street or highway driving? I have 2.73 gears in my 70 El Camino and I stick with a manually shifted D3 gear around town to keep the RPM's up a little and not load down the engine. I only do OD in my 4L60E on the interstate highway.
Rick
TECH Veteran
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From: Mississippi
4L60E tranmistrans go out all the time especially in heavier vehicles. The guys that make them last have lots of money in those tranmissions and they are in lightweight cars. And yes a Turbo 400 is stronger than a 4L60E.
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Thread Starter
Teching In
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I’ll go with the 400 then, thanks! What adapters do I need to make it fit? Just that center adapter ring?
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Teching In
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11 Second Club
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With that setup your th400 with sbc/bbc converter will bolt straight up. Typically you just need to run a 1/8" washer between the flex plate and the converter lugs when you bolt down the converter , to get the perfect spacing between the front pump in the trans and the crank pilot.
TH400 all the way.
4l60e are good when they work but if you drive the car hard often and especially WOT into 3rd gear, and/or top gear they do not last. With a basic rebuilt TH400 with BW clutches and a good full manual valve body and keeping trans temps under 180 it'll live a long time.
Last edited by Launch; Jan 11, 2020 at 07:58 PM.
TECH Junkie
Joined: Jun 2008
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From: Nitro Alley
Dey got-sta go out... how else naw yall gonna miss some a Tran-Mistrans!
Ya cants be missin' nuttin' if dey aint gonne out yet! Dang!
On The Tree
Joined: Dec 2019
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Just use a 98-02 fbody ls1 flexplate and the center round adapter ring just to extend the crank pilot hole. That way you won't mess things up because the truck engines had odd ball flexplates.
With that setup your th400 with sbc/bbc converter will bolt straight up. Typically you just need to run a 1/8" washer between the flex plate and the converter lugs when you bolt down the converter , to get the perfect spacing between the front pump in the trans and the crank pilot.
TH400 all the way.
4l60e are good when they work but if you drive the car hard often and especially WOT into 3rd gear, and/or top gear they do not last. With a basic rebuilt TH400 with BW clutches and a good full manual valve body and keeping trans temps under 180 it'll live a long time.
With that setup your th400 with sbc/bbc converter will bolt straight up. Typically you just need to run a 1/8" washer between the flex plate and the converter lugs when you bolt down the converter , to get the perfect spacing between the front pump in the trans and the crank pilot.
TH400 all the way.
4l60e are good when they work but if you drive the car hard often and especially WOT into 3rd gear, and/or top gear they do not last. With a basic rebuilt TH400 with BW clutches and a good full manual valve body and keeping trans temps under 180 it'll live a long time.
Sounds like somebody likes to party. **** I might even consider selling my rebuilt 4l60 and buy a turbo400. Not going to daily the car anyways.
i WORK WITH A GUY THAT HAS A 2004 silverado with a 4.8, 4L60E with 380,000 miles on it. He bought it brand new and uses it to tow a camper trailer through the mountains. Never been rebuilt and runs great still.
TECH Junkie
Joined: Jun 2008
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From: Nitro Alley
That's why there are hundreds of thousands of 4L60E's in TRUCKS AND VANS, FROM THE FACTORY.
i WORK WITH A GUY THAT HAS A 2004 silverado with a 4.8, 4L60E with 380,000 miles on it. He bought it brand new and uses it to tow a camper trailer through the mountains. Never been rebuilt and runs great still.
i WORK WITH A GUY THAT HAS A 2004 silverado with a 4.8, 4L60E with 380,000 miles on it. He bought it brand new and uses it to tow a camper trailer through the mountains. Never been rebuilt and runs great still.
NOT a Tran-Mistrans.
Thread Starter
Teching In
Joined: Sep 2019
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Just use a 98-02 fbody ls1 flexplate and the center round adapter ring to extend the crank pilot hole. That way you won't mess things up because the truck engines had odd ball flexplates.
With that setup your th400 with sbc/bbc converter will bolt straight up. Typically you just need to run a 1/8" washer between the flex plate and the converter lugs when you bolt down the converter , to get the perfect spacing between the front pump in the trans and the crank pilot.
TH400 all the way.
4l60e are good when they work but if you drive the car hard often and especially WOT into 3rd gear, and/or top gear they do not last. With a basic rebuilt TH400 with BW clutches and a good full manual valve body and keeping trans temps under 180 it'll live a long time.
With that setup your th400 with sbc/bbc converter will bolt straight up. Typically you just need to run a 1/8" washer between the flex plate and the converter lugs when you bolt down the converter , to get the perfect spacing between the front pump in the trans and the crank pilot.
TH400 all the way.
4l60e are good when they work but if you drive the car hard often and especially WOT into 3rd gear, and/or top gear they do not last. With a basic rebuilt TH400 with BW clutches and a good full manual valve body and keeping trans temps under 180 it'll live a long time.
11 Second Club
Joined: Jan 2003
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Yes. The early ls1 4th gen flexplates have the correct holes already drilled for the sbc/bbc converter lug pattern. The later flexplates and some of the sfi plates for our cars like the B&M one for example, do not. You have to drill them yourself. If you are not high HP, just grab one of these.. I have done over 50k miles at 540fwhp with this style flexplate behind a th400 in the past. This style below are also stronger than the later style (which rather than round holes the later ones have bigger oblong holes cut out in them)
https://www.ebay.com/itm/98-02-LS1-V...sAAOSwO0VeEL9e
https://www.ebay.com/itm/98-02-LS1-V...sAAOSwO0VeEL9e