Which GM trans?

RJ · 06-28-2009, 09:44 AM

Helping someone with a 3400 lb. car with big GM motor that makes about 950 hp. What would be a cost effective dependable automatic to go with?

Thanks

Ron Finney · 07-05-2009, 12:33 PM

Assuming this is for drag racing, a turbo 400 is the best choice at this weight and horspower. You could use a glide if you spend the bucks for a well built one....Probably be $2,500.00 to $3,500 for a glide that will be dependable at this power/weight level. The 400 is much beefier and the extra gear will help get the car moving easier off the line (2.48 vs.1.76). You will spend some decent bucks on a good 400 but it will be half of what a glide costs.

That's my take!

Ron

33 S/C

Bill Baer · 07-05-2009, 06:27 PM

Assuming this is for drag racing, a turbo 400 is the best choice at this weight and horspower. You could use a glide if you spend the bucks for a well built one....Probably be $2,500.00 to $3,500 for a glide that will be dependable at this power/weight level. The 400 is much beefier and the extra gear will help get the car moving easier off the line (2.48 vs.1.76). You will spend some decent bucks on a good 400 but it will be half of what a glide costs.
[QUOTE

Amen I agree heavyier than 3000# go with the 400.

Tom Goldman · 07-06-2009, 04:26 PM

TH400 for sure. ......At that HP I'd use a Vasco input from ATI or the supplier of your choice. .....Also, ATI has a center support that has a bearing to support the direct drum,which improves both ring sealing and sprag life. ....All the rest of the parts will live at that HP,altho I'd also use an aluminum direct drum , for a little added safety. ......I have a customer running a nostalga Gasser with a 1100 HP blown Hemi with this setup with no problems for over 3 years. ......Tom

06-28-2009, 09:44 AM	#1
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Which GM trans? Helping someone with a 3400 lb. car with big GM motor that makes about 950 hp. What would be a cost effective dependable automatic to go with? Thanks

07-05-2009, 12:33 PM	#2
Ron Finney Member Join Date: Jul 2008 Location: Greenwood, IN Posts: 168 Likes: 0 Liked 0 Times in 0 Posts	Re: Which GM trans? Assuming this is for drag racing, a turbo 400 is the best choice at this weight and horspower. You could use a glide if you spend the bucks for a well built one....Probably be $2,500.00 to $3,500 for a glide that will be dependable at this power/weight level. The 400 is much beefier and the extra gear will help get the car moving easier off the line (2.48 vs.1.76). You will spend some decent bucks on a good 400 but it will be half of what a glide costs. That's my take! Ron 33 S/C __________________ Ron Finney 396V S/C

07-05-2009, 06:27 PM	#3
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Which GM trans? Assuming this is for drag racing, a turbo 400 is the best choice at this weight and horspower. You could use a glide if you spend the bucks for a well built one....Probably be $2,500.00 to $3,500 for a glide that will be dependable at this power/weight level. The 400 is much beefier and the extra gear will help get the car moving easier off the line (2.48 vs.1.76). You will spend some decent bucks on a good 400 but it will be half of what a glide costs. [QUOTE Amen I agree heavyier than 3000# go with the 400. __________________ Bill Baer 3391 SC, 339B SC, QR

07-06-2009, 04:26 PM	#4
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,438 Likes: 778 Liked 703 Times in 206 Posts	Re: Which GM trans? TH400 for sure. ......At that HP I'd use a Vasco input from ATI or the supplier of your choice. .....Also, ATI has a center support that has a bearing to support the direct drum,which improves both ring sealing and sprag life. ....All the rest of the parts will live at that HP,altho I'd also use an aluminum direct drum , for a little added safety. ......I have a customer running a nostalga Gasser with a 1100 HP blown Hemi with this setup with no problems for over 3 years. ......Tom __________________ Tom Goldman 1500 SG , 1506 STK