727 trans questions ???
#2825876
09/28/20 12:09 AM
09/28/20 12:09 AM
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Posts: 7,982 Scranton, PA
Montclaire
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Hello, I just picked up a 74 Barracuda with a transplanted 440/727. The trans has been messed with. It's a not a manual or reverse pattern but it shifts into second at 1500 and the prior owner told me it won't shift into third until 9000 if you keep your foot in it. It also has an aftermarket converter with a drainback issue. I'm thinking it's going to need a valve body to fix whatever was done to it but I'm also wondering if the governor was swapped/modified. I have a complete small block 727 with part throttle kickdown from a 73 Roadrunner that I can rob for parts and a TF2 kit from transgo. Any thoughts? I don't know what year trans is in the car, the motor is a 60s forged crank 440. Thanks
Last edited by Montclaire; 09/28/20 02:04 AM.
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Re: 727 trans questions ???
[Re: Montclaire]
#2825980
09/28/20 11:05 AM
09/28/20 11:05 AM
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A727Tflite
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That's what he told me, I wasn't going to try it myself. I've been reading and it may be a throttle pressure issue caused by using a kit like the TF2 that I have. It may be easier to just swap to a stock valve body instead of playing detective. Agreed on starting with a standard valve body. If you have a stock valve body and standard governor most times you are good enough. If you want to firm up the shifts, etc. then go to a kit. But at this point make you have to wonder if the previous owner/builder didn’t dink with servo springs, front clutch tweaks. You won’t know until you start with a baseline valve body. I would do one thing at time, governor next if needed. As for drainback unless someone drilled the valve body then you likely have excessive pump clearance. Sonnax makes a regulator valve to help with this but try starting it in neutral - that will charge the converter. Keep us posted on your progress.
Last edited by Transman; 09/28/20 11:09 AM.
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Re: 727 trans questions ???
[Re: Montclaire]
#2826002
09/28/20 12:13 PM
09/28/20 12:13 PM
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Posts: 25,729 Rio Linda, CA
John_Kunkel
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it shifts into second at 1500 and the prior owner told me it won't shift into third until 9000 if you keep your foot in it. At the same throttle setting? A combination of governor mods and TP linkage adjustment can delay the WOT 2-3 upshift to extremes but it would also delay the 1-2 upshift.
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Re: 727 trans questions ???
[Re: John_Kunkel]
#2826018
09/28/20 12:55 PM
09/28/20 12:55 PM
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CSK
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it shifts into second at 1500 and the prior owner told me it won't shift into third until 9000 if you keep your foot in it. At the same throttle setting? A combination of governor mods and TP linkage adjustment can delay the WOT 2-3 upshift to extremes but it would also delay the 1-2 upshift. I had this same problem years ago, it would only get to 40 psi line pressure, so the 1-2 shift was great, 2-3 not so good, let off the trottle & it would shift,,, nail it & it would go back to 2nd gear,it had a governor problem as it turned out
Last edited by csk; 09/28/20 12:55 PM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: 727 trans questions ???
[Re: Montclaire]
#2826207
09/28/20 06:54 PM
09/28/20 06:54 PM
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Posts: 7,982 Scranton, PA
Montclaire
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I don’t know what kind of goofy shift kit is in this thing but it’s in second by 15 mph. It’ll ride out second forever if you let it. If you back off to very light throttle it slams into third at 45 mph. Hard. The shift points are completely wrong for the torque curve of the motor and the rear end. The car should be flying but it’s just dogging along in second forever - never gets to build any power and wants to run out well in third which it never sees.
I’m not sure if the converter is going to be an issue or not, I was told it’s a 2800 stall and it feels loose but I’ve run a factory Hemi converter before and it was fine. I’ll have to see how it responds to a stock valve body. In either case, I’ll get it running right. Feels good to be back in a big block e-body. 😎
Thanks
Last edited by Montclaire; 09/28/20 07:05 PM.
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Re: 727 trans questions ???
[Re: Montclaire]
#2826477
09/29/20 02:17 PM
09/29/20 02:17 PM
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Posts: 25,729 Rio Linda, CA
John_Kunkel
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Once again, are you saying it upshifts 1-2 at 15 mph with WOT or light throttle? If light throttle, try completely disconnecting the TP linkage at the trans lever and push the lever full forward. If it shifts early with the linkage disconnected the problem is in the linkage setup.
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Re: 727 trans questions ???
[Re: John_Kunkel]
#2826507
09/29/20 03:48 PM
09/29/20 03:48 PM
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Montclaire
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Once again, are you saying it upshifts 1-2 at 15 mph with WOT or light throttle? If light throttle, try completely disconnecting the TP linkage at the trans lever and push the lever full forward. If it shifts early with the linkage disconnected the problem is in the linkage setup. With ANY throttle. The pinion snubber is getting a workout lol
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Re: 727 trans questions ???
[Re: A727Tflite]
#2826595
09/29/20 07:22 PM
09/29/20 07:22 PM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
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Well that's what it's doing, and doing reliably so contradictory or not it's currently reality. I'll post a pic of the linkage at the carb when I get a minute. I want to test that first but I need a second set of eyes or hands. I agree it'll probably end up needing the valve body in the end but doing things in the right order may save work later.
Last edited by Montclaire; 09/29/20 07:24 PM.
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Re: 727 trans questions ???
[Re: Montclaire]
#2826629
09/29/20 08:03 PM
09/29/20 08:03 PM
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A727Tflite
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Well that's what it's doing, and doing reliably so contradictory or not it's currently reality. I'll post a pic of the linkage at the carb when I get a minute. I want to test that first but I need a second set of eyes or hands. I agree it'll probably end up needing the valve body in the end but doing things in the right order may save work later. Sorry, let me clarify “contradictory”. Upshift at 15 is sort of early depending on axle ratio. Light TP setting or fast rate governor. Then not shifting until 45 is late. High TP setting or slow rate governor. So that being said, if you try the TP disconnect mentioned and it shifts early for both shifts then the linkage is likely your issue. If it still shifts late on the 2-3 hen you likely have a vb issue.
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Re: 727 trans questions ???
[Re: Montclaire]
#2826869
09/30/20 01:06 PM
09/30/20 01:06 PM
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Joined: Feb 2003
Posts: 7,982 Scranton, PA
Montclaire
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Here’s the linkage setup. A little Mickey Mouse but doesn’t seem awful. Will get a better idea when I can look at the travel on the trans end.
Last edited by Montclaire; 09/30/20 01:07 PM.
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Re: 727 trans questions ???
[Re: Montclaire]
#2826879
09/30/20 01:23 PM
09/30/20 01:23 PM
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Joined: Jan 2003
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GomangoCuda
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Get the mopar adapter from holley and Put proper throttle pressure linkage on it. What you have there is definitely at least part of the problem. Hope you haven't hurt the trans.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: 727 trans questions ???
[Re: Montclaire]
#2826897
09/30/20 01:35 PM
09/30/20 01:35 PM
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Joined: Jan 2003
Posts: 25,729 Rio Linda, CA
John_Kunkel
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Here’s the linkage setup. Linkage setup? There is no linkage only a cable.
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