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Old 05-29-2011, 03:53 PM
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used 700r In 77 shortwide what to do

Hello all I'm upgrading my 77 pickup tranny from 350turbo too ,700r I got the tranny outof a 89 astrovan with a 4.3 v6, I opened the pan and I was surprised to see it so clean no metal in the pan filter even looked good the only reason parked was blown engine. So I have a 350 with this.. Is their any recommendations on what to dobefore installing tranny in pickup.i know I need to wire up lockup converter,get shorter driveshaft, change seals, filter , and pan gasket is their anything else I should consider. Thank you all.

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Old 05-29-2011, 04:02 PM
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What tourqe converter should I use for this, and flexplate?
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Old 05-29-2011, 04:24 PM
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I ended up replacing a 368 Cadillac Engine and 400 Turbo transmission with a 350 and 700R4, all I had to do was move the mounts and crossmember. The driveshaft needed the yoke and u-joint replaced, but that was it. The 700R will bolt right up to the 350 with the original flexplate and torque convertor. Hope this helps you with what you're doing. My car was an 81 Cadillac Sedan DeVille.
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Old 05-29-2011, 05:32 PM
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My feeling is if you want something that drops in and stays together for the vehicle life, get a TH400. There are many complaints about the 700s breakage and not taking the beating . A TH400 will not be broken with normal foolery. It take strategy and planning for a successfull TH400 kill. The engine rings and valve seals will be long dead, that TH400 will be shiftin pretty.

People add the GV splitting overdrives to them, and really keep you cooking.
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Old 05-29-2011, 05:39 PM
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Installed one once had to pull the pan and rewire a few things for 4th to work properly and early ones are different than later ones but I found info on line pretty easy. Still not a good trans in stock form to take any abuse as already stated. If you stay w a 350 or 400 the 400 has a crappy first gear compared to the 350. Ends up being a little taller so worse for low end but far supierior trans over the 350 fo abuse. I know now you have to choose.
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Old 05-29-2011, 06:14 PM
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Quote:
Originally Posted by bigals77
What tourqe converter should I use for this, and flexplate?
the starter and flexplate off of your 77 will work just fine, and you can use the converter that came out of the astrovan. 3" cut on the 77's driveshaft.
you will need to buy a new t.v cable as the one off of the astrovan has a different hookup. also, a geometry corrector kit more than likely will be needed for proper t.v. pull for the 700r4 as it uses t.v. pressure, thats not just kick down.
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Old 05-29-2011, 07:09 PM
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straight forward swap except for the TV cable.

You will need to get the geometry right for the TV cable or you will burn up the trans.

lock up kits can be purchased on line (summit or jegs)

the 700r has a low 1st gear which is nice if you have a 3.08 rear gear. It will help get the truck moving from a standing position. In first gear, a 3.08 rear gear with a 700r is equal to a 3.73 rear gear with a th350 trans. However the gear spread from 1st to 2nd is big with the 700r, but worth it if you have a highway type rear end gear.
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Old 06-04-2011, 02:15 PM
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Does anyone know about how to modify my factory crossmember for the 700 thanks
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Old 06-04-2011, 02:32 PM
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Also I was thinkin of going with b m 70248 lock up kit where I can set the lock up to a speed like 45 instead of as,soon as,it shifts to fourth and lug the engine down when in town has anyone used this kit any advice
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Old 06-04-2011, 02:35 PM
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If your th350 has the 9'' tail, driveshaft doesn't need to be cut.
Direct swap lengthwise.

Crossmember just has to move back a couple of inches and should still work.
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Old 06-04-2011, 02:39 PM
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Quote:
Originally Posted by bigals77
Also I was thinkin of going with b m 70248 lock up kit where I can set the lock up to a speed like 45 instead of as,soon as,it shifts to fourth and lug the engine down when in town has anyone used this kit any advice


Do you need an electronic speedo for this unit to function?
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Old 06-05-2011, 08:33 AM
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Yesthis kit is for electric speedo and makes it mechanical ri
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Old 06-05-2011, 08:42 AM
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Quote:
Originally Posted by bigals77
Yesthis kit is for electric speedo and makes it mechanical ri

Sorry, I didn't understand this post.

I know on my 76 truck, I had to install a reluctor on the tranny and a vss that still allowed me to use my stock speedo.
I needed the signal for the ECM for the TPI.
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Old 06-05-2011, 10:13 AM
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From what I unferstand on this kit it uses the electric speedo connector then u plug into it with a gear driven connector that I hook into my original speedo cable from 77 then its wired into a dash mounted adjustable speed switch to lock converter when desired speed is reached
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Old 06-05-2011, 10:24 AM
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Quote:
Originally Posted by 123pugsy
Sorry, I didn't understand this post.

I know on my 76 truck, I had to install a reluctor on the tranny and a vss that still allowed me to use my stock speedo.
I needed the signal for the ECM for the TPI.

I better clarify this.

What I used for a speed sensor was a gear driven device that goes into the speedo location on the tailstock and it had an output that the speedo cable screws onto and two wires coming out of it for the vss electronic signal.

JAGS THAT RUN

Does it come with something like on the link?

Last edited by 123pugsy; 06-05-2011 at 10:31 AM.
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