700R4 problem
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Instructor
Joined: Mar 2002
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From: Brentwood Essex
700R4 problem
Finished setting up the engine last weekend and ran her for the first time at WOT with boost. Colour me happy.
Unfortunately, the last run I did the car seemed not to want to shift from 2nd to 3rd. I backed off the throttle a bit and she changed up OK. Went to drive her today, and now she won't shift out of first! Checked tranny fluid levels, and worked the shift through the range, all to no avail.
I knew I'd have to upgrade the tranny at some point, but didn't expect to hurt it so soon!
So, what do you think has broken, and what should I do at this stage to support 600 horses? Guess I'll put taller gears on at the same time, as I'm still stock at the moment.
TIA
Steve
Unfortunately, the last run I did the car seemed not to want to shift from 2nd to 3rd. I backed off the throttle a bit and she changed up OK. Went to drive her today, and now she won't shift out of first! Checked tranny fluid levels, and worked the shift through the range, all to no avail.
I knew I'd have to upgrade the tranny at some point, but didn't expect to hurt it so soon!
So, what do you think has broken, and what should I do at this stage to support 600 horses? Guess I'll put taller gears on at the same time, as I'm still stock at the moment.
TIA
Steve
Safety Car
Joined: Oct 2001
Posts: 4,763
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From: Connectivette
Re: 700R4 problem (steveelsbury)
Thats what was happening to my tranny when she decided to go. Ended up with a complete $1500 rebuild with some goodies. I had 118K on the tranny so it really didn't owe me anything. How many miles on yours?
Le Mans Master
Joined: Jan 2002
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From: Kyle TX (Because Mojo Made me fill it in)
Re: 700R4 problem (steveelsbury)
Le Mans Master
Joined: Aug 2000
Posts: 5,192
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From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: 700R4 problem (steveelsbury)
I don't know what's broken but the stock 700R4 can only handle 400 maybe 500 hp, that's it! :eek: I would say it's time to beef it up a bit. :yesnod:
Safety Car
Joined: Dec 2000
Posts: 3,767
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From: Jacksonville Fl
Re: 700R4 problem (steveelsbury)
I can see the trans dying the first weekend of running a 600 HP motor.
You will have to rebuild it, every year or so! You should seriously consider upgrading to a 4L80E ( conversion kit's can be had )...or converting to the TH400 with a Gear Vendors overdrive ( complete kits are available as well ).
Other than that, maybe converting to a 6 speed manual would handle the power.
You will have to rebuild it, every year or so! You should seriously consider upgrading to a 4L80E ( conversion kit's can be had )...or converting to the TH400 with a Gear Vendors overdrive ( complete kits are available as well ).
Other than that, maybe converting to a 6 speed manual would handle the power.
Safety Car
Joined: Dec 2000
Posts: 3,767
Likes: 5
From: Jacksonville Fl
Re: 700R4 problem (steveelsbury)
Thread Starter
Instructor
Joined: Mar 2002
Posts: 176
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From: Brentwood Essex
Re: 700R4 problem (BBA)
I can see the trans dying the first weekend of running a 600 HP motor.
I guess I was asking about upgrade paths, as I never expected the stock Tranny to last long - although a little bit longer then it actually did might have been nice!
So I'll be relying on advice from those who have gone before. I visited all the quoted threads, and there's lots of good info there. I guess my bottom line is I want a tran which will handle the power....plus 300 more when the NOS kit goes on :reddevil ... and ideally, it should bolt right up.
Converting to the TH400? Do you mean replacing the R4 with a TH400, or can changes be made to turn one into the other? I've heard nothing but good things about the Gear Vendors overdrive unit, BTW.
I considered upgrading to a manual, but I really prefer autos.
[Modified by steveelsbury, 11:39 PM 9/28/2002]
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