Broke my 700R4!
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Broke my 700R4!
Was heading down to the Drive-in from the shop, came out of a slow zone on the county road and stepped on it at about 30 MPH in first gear. Ran it up to about 6800 and manually shifted into second. It shifted good and firm into second and a second or two later BANG and the motor zinged up.
I let off, and I felt the tranny catch again. I gave it just a little throttle and it continued to hold. I shifted into third and it felt normal. I let off the gas and the engine fell to idle, the car free wheeled. Gave it gas and the tranny caught again. It does this in every gear.
I drove it very gingerly to the Drive-in cruise night and then home afterwords.
I talked to my buddy who built the tranny and he said it sounds like I took out a sprag. That was my first guess too. Time to tear it down and find out.
The tranny was originally built for my 64 Impala SS with a mildly warmed over 350. My buddy beefed up the 700, but he wasn't expecting me to put 600 horses in front of it and put it in the Corvette.
Oh the joy of power!
I let off, and I felt the tranny catch again. I gave it just a little throttle and it continued to hold. I shifted into third and it felt normal. I let off the gas and the engine fell to idle, the car free wheeled. Gave it gas and the tranny caught again. It does this in every gear.
I drove it very gingerly to the Drive-in cruise night and then home afterwords.
I talked to my buddy who built the tranny and he said it sounds like I took out a sprag. That was my first guess too. Time to tear it down and find out.
The tranny was originally built for my 64 Impala SS with a mildly warmed over 350. My buddy beefed up the 700, but he wasn't expecting me to put 600 horses in front of it and put it in the Corvette.
Oh the joy of power!
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
you put 600 horse in front of any 700, and you got a grenade on your hands....doubtful any 700 can be built to take that for long....
better to find a 4L80e and go with that in a truly built up form....
better to find a 4L80e and go with that in a truly built up form....
Melting Slicks
Joined: Aug 2004
Posts: 2,063
Likes: 1
From: Beverly Massachusetts
Was heading down to the Drive-in from the shop, came out of a slow zone on the county road and stepped on it at about 30 MPH in first gear. Ran it up to about 6800 and manually shifted into second. It shifted good and firm into second and a second or two later BANG and the motor zinged up.
I let off, and I felt the tranny catch again. I gave it just a little throttle and it continued to hold. I shifted into third and it felt normal. I let off the gas and the engine fell to idle, the car free wheeled. Gave it gas and the tranny caught again. It does this in every gear.
I drove it very gingerly to the Drive-in cruise night and then home afterwords.
I talked to my buddy who built the tranny and he said it sounds like I took out a sprag. That was my first guess too. Time to tear it down and find out.
The tranny was originally built for my 64 Impala SS with a mildly warmed over 350. My buddy beefed up the 700, but he wasn't expecting me to put 600 horses in front of it and put it in the Corvette.
Oh the joy of power!
I let off, and I felt the tranny catch again. I gave it just a little throttle and it continued to hold. I shifted into third and it felt normal. I let off the gas and the engine fell to idle, the car free wheeled. Gave it gas and the tranny caught again. It does this in every gear.
I drove it very gingerly to the Drive-in cruise night and then home afterwords.
I talked to my buddy who built the tranny and he said it sounds like I took out a sprag. That was my first guess too. Time to tear it down and find out.
The tranny was originally built for my 64 Impala SS with a mildly warmed over 350. My buddy beefed up the 700, but he wasn't expecting me to put 600 horses in front of it and put it in the Corvette.
Oh the joy of power!
this is what i am thinking of going with if i end up getting if i get my re-enlistment bonus.
http://www.bowtieoverdrives.com/cata...php?ITEMID=677
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
this is what i am thinking of going with if i end up getting if i get my re-enlistment bonus.
http://www.bowtieoverdrives.com/cata...php?ITEMID=677
http://www.bowtieoverdrives.com/cata...php?ITEMID=677
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Gas heading to 5 bux/gallon soon enough man's pushing 600 hp, and he wants a cheeep tranny.....sublime......
no offense, I just thought that funny,
I dunno man, lotsa guys with less than great performance out of 700 based units and super high HP/TORQUE.....the main weak point seems to be the 3/4 clutch pack has no room and inadequate cooling oiling passages....I certainly no expert, but from what I hear....you would be on the bleeding edge there....
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Absolutely no offense taken. I'm glad you found it funny because it was meant as a joke. Performance and cheap don't go in the same sentence.
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Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I still have my 850 hp Art Carr 700R4. I used it with my 600 some hp 427 SBC Motown up until I changed to a manual tranny.
You said yours broke at 6800 rpm. doing a 1-2 shift. I could never get any traction even with slicks at a prepped drag strip and 10X26 slicks. My rear street 315's could leave long wide black marks.
So my fix was to install a 5000 rpm gov. and leave it in 2nd on the line and let it do a 1-2 and then manually ship into 3-4.
My tranny was over $2500 and the 9.5 inch TC was another $1100 I used 1/2 ID lines right off the case to the biggest 1/2 in and out B&M cooler
You said yours broke at 6800 rpm. doing a 1-2 shift. I could never get any traction even with slicks at a prepped drag strip and 10X26 slicks. My rear street 315's could leave long wide black marks.
So my fix was to install a 5000 rpm gov. and leave it in 2nd on the line and let it do a 1-2 and then manually ship into 3-4.
My tranny was over $2500 and the 9.5 inch TC was another $1100 I used 1/2 ID lines right off the case to the biggest 1/2 in and out B&M cooler
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
I still have my 850 hp Art Carr 700R4. I used it with my 600 some hp 427 SBC Motown up until I changed to a manual tranny.
You said yours broke at 6800 rpm. doing a 1-2 shift. I could never get any traction even with slicks at a prepped drag strip and 10X26 slicks. My rear street 315's could leave long wide black marks.
So my fix was to install a 5000 rpm gov. and leave it in 2nd on the line and let it do a 1-2 and then manually ship into 3-4.
My tranny was over $2500 and the 9.5 inch TC was another $1100 I used 1/2 ID lines right off the case to the biggest 1/2 in and out B&M cooler
You said yours broke at 6800 rpm. doing a 1-2 shift. I could never get any traction even with slicks at a prepped drag strip and 10X26 slicks. My rear street 315's could leave long wide black marks.
So my fix was to install a 5000 rpm gov. and leave it in 2nd on the line and let it do a 1-2 and then manually ship into 3-4.
My tranny was over $2500 and the 9.5 inch TC was another $1100 I used 1/2 ID lines right off the case to the biggest 1/2 in and out B&M cooler
I wasn't really having any problems with heat though, but I was not racing it, just driving.
Instructor
Joined: Apr 2009
Posts: 219
Likes: 0
From: Missouri
this is what i am thinking of going with if i end up getting if i get my re-enlistment bonus.
http://www.bowtieoverdrives.com/cata...php?ITEMID=677
http://www.bowtieoverdrives.com/cata...php?ITEMID=677
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
gkull, I sent you a PM.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
well mine has a lockup in fourth gear only and when I first got it it would bang the gears so hard even at light throttle that I felt sorry for the u-joints. I took it back and had it made softer. 
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
If I remember correctly you had 4.11 gears. I hadn't got around to changing out my stock 3.07 gears yet. This calmed it down a lot. I have 3.73 gears planned still.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Melting Slicks
Joined: Jun 2002
Posts: 2,844
Likes: 99
From: Orrtanna Pa.
Was heading down to the Drive-in from the shop, came out of a slow zone on the county road and stepped on it at about 30 MPH in first gear. Ran it up to about 6800 and manually shifted into second. It shifted good and firm into second and a second or two later BANG and the motor zinged up.
I let off, and I felt the tranny catch again. I gave it just a little throttle and it continued to hold. I shifted into third and it felt normal. I let off the gas and the engine fell to idle, the car free wheeled. Gave it gas and the tranny caught again. It does this in every gear.
I drove it very gingerly to the Drive-in cruise night and then home afterwords.
I talked to my buddy who built the tranny and he said it sounds like I took out a sprag. That was my first guess too. Time to tear it down and find out.
The tranny was originally built for my 64 Impala SS with a mildly warmed over 350. My buddy beefed up the 700, but he wasn't expecting me to put 600 horses in front of it and put it in the Corvette.
Oh the joy of power!
I let off, and I felt the tranny catch again. I gave it just a little throttle and it continued to hold. I shifted into third and it felt normal. I let off the gas and the engine fell to idle, the car free wheeled. Gave it gas and the tranny caught again. It does this in every gear.
I drove it very gingerly to the Drive-in cruise night and then home afterwords.
I talked to my buddy who built the tranny and he said it sounds like I took out a sprag. That was my first guess too. Time to tear it down and find out.
The tranny was originally built for my 64 Impala SS with a mildly warmed over 350. My buddy beefed up the 700, but he wasn't expecting me to put 600 horses in front of it and put it in the Corvette.
Oh the joy of power!
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
and you don't need o/drive in Maryland....I didn't....
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
What did BTO have to say about the failure? They claim a less than 1 percent failure rate.
Melting Slicks
Joined: May 2002
Posts: 2,431
Likes: 52
From: Florida
4L80e = tough SOB
