Turbo 400

NHRA1926 · 10-18-2020, 07:09 PM

Looking for a good transmission rebuilder near Bowling Green Ky. Ive broken my turbo 400 5 times in the last 3 years. Need some one that can get me more than 30-50 runs between rebuilds. 496" pump gas, 67 Camaro, 3700 lbs, runs low 10's 128 mph. Sick of pulling tranny out seems like every 6 or 7 races. Never had an issue when Sepanick did my work. But he is now 11 hours away. Any suggestions would be appreciated.

nickh · 10-18-2020, 08:38 PM

check your pm's

Alan Roehrich · 10-18-2020, 08:50 PM

Quote:

Originally Posted by NHRA1926

Looking for a good transmission rebuilder near Bowling Green Ky. Ive broken my turbo 400 5 times in the last 3 years. Need some one that can get me more than 30-50 runs between rebuilds. 496" pump gas, 67 Camaro, 3700 lbs, runs low 10's 128 mph. Sick of pulling tranny out seems like every 6 or 7 races. Never had an issue when Sepanick did my work. But he is now 11 hours away. Any suggestions would be appreciated.

Thomas Arnett.

Or, if you want to come south, I'm in Murfreesboro. Been in the business since 1985.

What's breaking? Or burning up.

NHRA1926 · 10-19-2020, 09:51 AM

Well, it's been several different things. I've broken second gear, gear set, first gear, gear set, 34 element sprague, (replaced with 36 element sprague and drum). Trans brake valve continues to stick in the housing. Had to use pliers to remove, and re-install the valve at Beechbend this weekend, so I believe the case must have some issues where the valve rides. Now the car will only go forward. When I put it in reverse, the car does not move, until I give it a considerable amount of throttle, then it snaps and releases continually while in reverse. When I put it in first gear it rolls forward about 3 feet, then slows down all on it's own, until I give it more throttle. When I jacked the car up and removed the drive shaft from the rear end, keeping it in the transmission, the drive shaft will rotate in the forward direction, but will not rotate in the rearward direction while the transmission is any gear other than park. And I just want to clarify that this is with the engine not running. The rear end rotates forward and rearward with the drive shaft removed, so the problem is not the rear end.

Hacksaw · 10-19-2020, 03:07 PM

Think I'd start looking for another donor case. Too much carnage and trouble. Your valve body may be suspect also.

NHRA1926 · 10-19-2020, 04:13 PM

Well, I just dropped it off at my tranny guy. We'll wait and see what he says is the problem this time. Probably gonna find another place to deal with, or maybe switch to a power glide. But I don't want to loose my 2-3 foot wheel stands, and I probably will with a glide. I was told Arnett is great with Stock and Super Stock stuff, but I run bracket races on a weekly basis and some Super Street events, so I put a lot more runs on the car than a Stock/Super Stock between rebuilds.

Bill Grubbs · 10-19-2020, 05:11 PM

Obviously you have some problems...

But to throw shade at Stock and Super Stock trans builders will not get you much help. I guess you put over 300 runs on a tranny in a season.

Oh well🙄

Dave Noll · 10-19-2020, 07:42 PM

There are several GM transmissions for sale in the Classifieds here on CL.

Todd Geisler · 10-21-2020, 07:22 AM

Contact RPM Transmisions in Anderson Indiana. They can resolve your issue.

57 Vette · 10-21-2020, 07:51 AM

I would put a Power Glide in it and be done with the THM 400 once and for all.
Just make sure you use a good converter. If you are going to use the THM 400 converter make sure you send it back to update the stator because the stall ratio is different. Also use a good straight cut 1:80 planetary.
What et you lose in 60 foot you will make back up down track and should pick up some mph. As Marv Ripes from A-1 transmissions and converters once told me that 99% of all cars would benefit from using a Power Glide.

10-18-2020, 07:09 PM	#1
NHRA1926 Member Join Date: Dec 2015 Location: Bowling green, Ky Posts: 230 Likes: 12 Liked 202 Times in 62 Posts	Turbo 400 Looking for a good transmission rebuilder near Bowling Green Ky. Ive broken my turbo 400 5 times in the last 3 years. Need some one that can get me more than 30-50 runs between rebuilds. 496" pump gas, 67 Camaro, 3700 lbs, runs low 10's 128 mph. Sick of pulling tranny out seems like every 6 or 7 races. Never had an issue when Sepanick did my work. But he is now 11 hours away. Any suggestions would be appreciated.

10-18-2020, 08:38 PM	#2
nickh Senior Member Join Date: Sep 2010 Location: Houston,Texas Posts: 798 Likes: 3,178 Liked 574 Times in 176 Posts	Re: Turbo 400 check your pm's

10-19-2020, 09:51 AM	#4
NHRA1926 Member Join Date: Dec 2015 Location: Bowling green, Ky Posts: 230 Likes: 12 Liked 202 Times in 62 Posts	Re: Turbo 400 Well, it's been several different things. I've broken second gear, gear set, first gear, gear set, 34 element sprague, (replaced with 36 element sprague and drum). Trans brake valve continues to stick in the housing. Had to use pliers to remove, and re-install the valve at Beechbend this weekend, so I believe the case must have some issues where the valve rides. Now the car will only go forward. When I put it in reverse, the car does not move, until I give it a considerable amount of throttle, then it snaps and releases continually while in reverse. When I put it in first gear it rolls forward about 3 feet, then slows down all on it's own, until I give it more throttle. When I jacked the car up and removed the drive shaft from the rear end, keeping it in the transmission, the drive shaft will rotate in the forward direction, but will not rotate in the rearward direction while the transmission is any gear other than park. And I just want to clarify that this is with the engine not running. The rear end rotates forward and rearward with the drive shaft removed, so the problem is not the rear end.

10-19-2020, 03:07 PM	#5
Hacksaw Senior Member Join Date: Sep 2016 Posts: 875 Likes: 192 Liked 300 Times in 168 Posts	Re: Turbo 400 Think I'd start looking for another donor case. Too much carnage and trouble. Your valve body may be suspect also.

10-19-2020, 04:13 PM	#6
NHRA1926 Member Join Date: Dec 2015 Location: Bowling green, Ky Posts: 230 Likes: 12 Liked 202 Times in 62 Posts	Re: Turbo 400 Well, I just dropped it off at my tranny guy. We'll wait and see what he says is the problem this time. Probably gonna find another place to deal with, or maybe switch to a power glide. But I don't want to loose my 2-3 foot wheel stands, and I probably will with a glide. I was told Arnett is great with Stock and Super Stock stuff, but I run bracket races on a weekly basis and some Super Street events, so I put a lot more runs on the car than a Stock/Super Stock between rebuilds.

10-19-2020, 05:11 PM	#7
Bill Grubbs Member Join Date: Oct 2002 Location: Magnolia, Texas Posts: 414 Likes: 1 Liked 557 Times in 65 Posts	Re: Turbo 400 Obviously you have some problems... But to throw shade at Stock and Super Stock trans builders will not get you much help. I guess you put over 300 runs on a tranny in a season. Oh well🙄

10-19-2020, 07:42 PM	#8
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 707 Likes: 2,606 Liked 236 Times in 109 Posts	Re: Turbo 400 There are several GM transmissions for sale in the Classifieds here on CL. __________________ Dave Noll, EF/S ,?/SA 6526

10-21-2020, 07:22 AM	#9
Todd Geisler Member Join Date: Feb 2002 Posts: 328 Likes: 64 Liked 345 Times in 149 Posts	Re: Turbo 400 Contact RPM Transmisions in Anderson Indiana. They can resolve your issue.

10-21-2020, 07:51 AM	#10
57 Vette Junior Member Join Date: Jul 2018 Posts: 44 Likes: 378 Liked 38 Times in 14 Posts	Re: Turbo 400 I would put a Power Glide in it and be done with the THM 400 once and for all. Just make sure you use a good converter. If you are going to use the THM 400 converter make sure you send it back to update the stator because the stall ratio is different. Also use a good straight cut 1:80 planetary. What et you lose in 60 foot you will make back up down track and should pick up some mph. As Marv Ripes from A-1 transmissions and converters once told me that 99% of all cars would benefit from using a Power Glide.