Tranny Pump

Ty'sphoon0141

Only Ty in Maine
Has anyone ever removed the tranny pump? Does the whole tranny have to come out or can you do it on the truck? This may be my winter project to get the Ty back on the road. I've been looking into a couple of brands, anyone have any recommendations.
Thanks in advance.
 

Norm

Donating Member
Re: Tranny Pump

You have to take the tranny out. The pump is located up front,where the convertor goes into it. On the convertor there is 2 notches that goes into the pump. Good luck.
 

NecroWolf

lost marbles member
Re: Tranny Pump

it's not too hard to do, other than pulling the tranny. but that will make it a lot easier. make sure you have a good gasket when you put it back in and torque all the bolts evenly
 

4C FED

Absolutum Dominium
Re: Tranny Pump

I bought mine from Bowtie Overdirives.

When you do get the trans out, you'll need to remove the filter and the tube that feeds the aux. valvebody. If you don't your doomed.
 

TYHOGG

Active member
Re: Tranny Pump

I used TCI part #373388 10 vane pump on my rebuild a few years ago. I have not had a probelm since, but I have heard TCI is having problems with reliabilty latly.
 

Ty'sphoon0141

Only Ty in Maine
Re: Tranny Pump

Thee is a leak in the front end of the Tranny. I was told by a shop that the pump pressure was rather low. I figure that I should just replace the pump in it. Now, I have actually decided that since the whole thing has to come out, I will get it rebuilt over the winter.

Thanks guys.
 
Re: Tranny Pump

Working on a transmission can be kind of intimidating if you've never done it before. Working on a 700R4 (they're now called 4L60) isn't all that bad. Remove the torque converter, pan, and filter. Then remove the torque converter clutch lockup solenoid. It's the electrical doodad that points straight up into the pump. It's at the very front, on the passenger side. It's held in by two 10mm bolts. It should just pull right out. Remove the seven bolts holding the pump into the trans case. Now there's actually a special tool made just for removing the pump, but most people can get by without it. From the bottom (inside the pan area), you can take a large screwdriver or prybar, and *GENTLY* pry up on the backside of the pump. All you're trying to do is break the bond between the pump and the gasket. You don't necessarily want to try and remove the pump by prying it this way. When the bond does break, you should be able to wiggle the pump out of the case. Don't get discouraged, it will take quite a bit of wiggling. By the way, the large splined hub sticking out of the front will come out with the pump, so it's okay to pull on it. The splined shaft sticking out through that hub however, will not.

If you end up not going through the whole tranny, just be sure to use a new gasket, a new pump O-ring, and a new torque converter seal. Oh yeah---the seven bolts have little seals around the heads.....replace these too.

The torque spec for the pump bolts is 18 lb-ft. Torque them in a star pattern.

One more thing......do your best to start all the pump bolts before you completely drop the pump all the way in.

Good luck....and if you get stuck, just speak up. There's a ton of willingly helpful people here.

4C FED---I've never known a 700 to have an auxiliary valve body---maybe you're thinking of a 2004R? There are no tubes in a 700.
 

jwaller

Evil Genius/SyTy Guru
Re: Tranny Pump

GMPartsGuy said:
4C FED---I've never known a 700 to have an auxiliary valve body---maybe you're thinking of a 2004R? There are no tubes in a 700.


this is 100% wrong. 700 do in fact have an aux VB and it's loacted in the rear of the pan area and is connected to the pump via a supply tube that runs from the front pump near the filter port.

I can supply you with a fully blueprinted pump with all the special noncommercially available goodies for about the same as your going to get ripped by tci or bowtie.

lioke everyone says once the tran is out it's not bad. you will need several seals/orings to complete the job.
 
Re: Tranny Pump

Admiral Waller-----I stand corrected. I do remember the tube now. I'm so used to working on 4L60E's that I nearly forgot about the tube. That should tell you how long it's been since I peeled a 700 apart. Sorry for the mistake.
 

jwaller

Evil Genius/SyTy Guru
Re: Tranny Pump

GMPartsGuy said:
Admiral Waller-----I stand corrected. I do remember the tube now. I'm so used to working on 4L60E's that I nearly forgot about the tube. That should tell you how long it's been since I peeled a 700 apart. Sorry for the mistake.

thats ok. you were kinda right but not about syty trannies. the very early 700's did not have the aux vb. so you can take some solice in that.
 
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