dumb tf 7272 ?

1

1hc72

Member
How hard is it for an inexperienced person(me) to rebuild a tf 7272 tranny,do I need any specilaty tools, parts or anything else? How long would it take for a rebuild? Im leaking fluid from the front of my tranny
 
There are several "special tools" needed, just like for working on any complex assembly.

In other threads here, I've mentioned the best reference for the torqueflite series, the book by carl munroe. Get that book and digest it if you are thinking of diy. Review every thread here and decide for yourself if you have the knowledge, skills, and tools to do this.

If it's a simple leak from the front seal, then those are easily replaced, but in order to do that correctly, the bushing in the front pump needs to be replaced at the same time. That is far from being an "overhaul" though!
 
Ok, I asked around and goet a quote for 1500!! Personally I think they are just trying to rip me off
 
michael mayben said:
if it's a simple leak from the front seal, then those are easily replaced, but in order to do that correctly, the bushing in the front pump needs to be replaced at the same time. That is far from being an "overhaul" though!
Click to expand...

Just some other info, when I bought my 74 Scout I was told tranny needed an overhaul, it too was leaking bad from the front seal.
Well it needed neither the torque converter had a crack in it. It was hard to see even out of the tranny. But a simple fix.
Michael has some really good info on here about the 727's.

Ron
 
And if it is the torque converter how easy is it to change it out and 2nd what stall speed do I need, 3rd how much atf fluid does it take?
 
Changing the torque converter does require you pull the transmission. Not a bad job, but by yourself on jack stands tough. By myself I can pull it in about 3 hours I have pulled a few. If you have never done it find a buddy who has, a tranny jack is very helpful.
The torque converter specs are not something I mess with I have always went stock.
The tq fills when you fill the tranny.
I am sure Jeff can full fill your needs if thats what it is.
I quess all I am saying is that you need to pull the tranny before you know what's really wrong. I was going to part out my 74 but a $80 tq fixed it so now I drive it everywhere.

Ron
 
Tranny fluid is quite possibly the worst when it comes to leaving puddles. It's like 3 drops make a 10 inch stain.

And yes, 2 qts a month is very bad.
 
1hc72 said:
can you add a 4th gear to a tf 727 tranny?
Click to expand...

Not to the version you have. The much later version od cases were completely different from the mid-section back.

And your next question will be..."what about a lock-up torque converter?". Short answer is "no". The lock-up torque converter system in chrysler apps during that era was extremely problematic and only had any life expectancy when used in very low torque engine apps in very light vehicles.

Imho, you need to completely forget about anything that has to do with "improving mileage" regarding that pickup. It ain't gonna happen. It is what it is...a truck from the 70's when no one gave a shit about mileage and a vehicle designed to work...not cruise the mall.

Pull the trans, replace the front pump bushing and seal. If the existing torque converter doesn't fall within the range of rpm specs we've discussed around here, then replace it with a reman and move on.

At the same time, replace the internal filter, the two shifter mechanism seals, and adjust the bands as described elsewhere in this sub-forum.

And replace the seal in the tail housing behind the output yoke.
 
Alright not sure if trany is ready to die or what here is the situation 1st gear shits at 10mph 2nd shifts at 20 mph then the rest is all 3rd gear up to 50. Is this normal?
 
At which accelerator position -- part throttle / medium throttle / wot?

The "shift points" for each gear should vary according to how much "throttle is used". I assume the IH service manual has "spec" for the tf 727 "shift points".

At are "toast" if they do not move forward or reverse or they slip (engine revs more than would be needed for a given speed) -- exceptions to this are low at fluid / broken shift linkage / incorrectly adjusted shift linkage and possibly "plugged" filter / screen / "old" at fluid.

Your problem mught be the "kick down" linkage (from carb to trans).

Michael mayben has post(s) on the kick down linkage in this forum.
 
Doesnt matter if it is floored, part way or barley tapping the gas

robertc said:
at which accelerator position -- part throttle / medium throttle / wot?

The "shift points" for each gear should vary according to how much "throttle is used". I assume the IH service manual has "spec" for the tf 727 "shift points".

At are "toast" if they do not move forward or reverse or they slip (engine revs more than would be needed for a given speed) -- exceptions to this are low at fluid / broken shift linkage / incorrectly adjusted shift linkage and possibly "plugged" filter / screen / "old" at fluid.

Your problem mught be the "kick down" linkage (from carb to trans).

Michael mayben has post(s) on the kick down linkage in this forum.
Click to expand...
 
1hc72 said:
doesnt matter if it is floored, part way or barley tapping the gas
Click to expand...

A service manual has a complete analysis and diagnostic for determining correct upshift/downshift scenarios. And that set of tables is based upon correct adjustments and an oem gearing and tire size.

The information for a pickall is for a pickall, the same type info for a Scout II is particular to a Scout II. The two platforms are not the same, so the correct service data must be used!
 
Ok guys, I fixed 1 problem with my tranny, if I shift it manually it runs great!! Although 45 is still relativly top end, can I add an overdrive box for freeway use, as I do a lot of freeway driving would love to be able to do 65!
 
1hc72 said:
ok guys, I fixed 1 problem with my tranny, if I shift it manually it runs great!! Although 45 is still relativly top end, can I add an overdrive box for freeway use, as I do a lot of freeway driving would love to be able to do 65!
Click to expand...

You haven't "fixed" anything!

Your truck (and any other similar vehicle) will have a top speed at redline of around 95mph and cruise very comfortably at 65mph (about 2900>3100 rpm) pulling a fully loaded trailer.

Have you verified that the throttle cable adjustment will allow wot??? Only after verifying and correcting throttle cable adjustment do you then verify/adjust the throttle pressure control for the transmission.

So only after verifying the above, can you begin a diagnosis regarding why your top speed is 45mph and the shift points are out of whack.

If the only way you can actually make the trans shift is through manual control, then you have major issues going on.

$1500 for a full 727 build at today's independent shop labor rates is certainly not by any means excessive...especially if that includes r&r. Many transmission shops will not r&r this old stuff any longer because of all the po virus crap they encounter in doing so. But they will bench-build a trans.

The 727 builds I perform (bench build only, parts and labor) run from $650 for a basic "stock" freshening, to approximately $1050 for a maxi-trans for rv/towing service with the best of everything including a transgo shift improvement system. And my labor rates are way below the typical local commercial shop. A maxi-build 727 from the best local commercial shop (bench work only) goes for $1350 plus. That is for a 2x4 version or 4x4 inna pickall. Add another $165 for a Scout II if the output shaft bearing needs to be replaced, ihon is the only source for the correct bearing for that application.

None of the above includes a replacement torque converter...for that, add in another $115>$375 depending upon what ya want.
 
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