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post #1 of (permalink) Old 01-28-2004, 10:56 PM
CodyLee19
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5 speed for a 700R4 project

Hey , I have a 91 L.D. 3/4 ton 4x4. It has a 350 and a 5 speed. The 5 speed is the problem. Its too weak, I keep on going through tranny's about every 20k miles.. At 2k a pop that game gets old. I am going to be putting in a mildly built 454 or a nice 383 in there in the next 3-6 months, so I want to get rid of this transmission first. I plan on doing a 700R4 built to the hilt with a manual valvebody.I have access to a core for it now. It came out of a 2wd truck. What will I need to swap out or buy when I build this transmission. What changes will I have to make to make it work. I know a stand alone computer, what else? What will I need to do with my crossmember, or driveshafts? any other ideas? Will the transfer case bolt up, will I need to buy adapters for it? Mainly, what will I have to change with the transmission coming out of the 2wd? Thanks Cody Lee
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post #2 of (permalink) Old 01-29-2004, 07:41 AM
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Re: 5 speed for a 700R4 project

Well, the output shaft will have to be changed in the 700R4 at a bare minimum. Some cases you couldn't even convert to 4wd. You're better off finding a smoked 4x4 700R4.

What do you need a standalone computer for?

I'd put a NV5600 in it if you keep smoking NV4500s. Especially since you don't seem to mind plunking down the $2k every other year.
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post #3 of (permalink) Old 01-29-2004, 08:51 AM
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Re: 5 speed for a 700R4 project

I don't get what your saying. You say some cases I couldn't even convert to 2wd. How is that? What is different from other 2wd. I need the standalone computer to keep the stall converter locked up in 4th gear so it won't burn the tranny up. I have a aluminum getrag transmission also. Trust me I would love to have the nv4500 or nv5600. I don't have 3k just for the tranny plus 1500 for a rebuild for it though. But thanks for the help though wrath. I guess I should have been clearer to begin with thanks.
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post #4 of (permalink) Old 01-29-2004, 09:03 AM
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Re: 5 speed for a 700R4 project

Some 700R4's cases can't be converted from 2wd to 4wd (the way the tailhousing bolts up). Most can. I'm not aware of any 2wd transmission that has an output shaft that'll work in a 4wd (I don't know how they'd do it anyway).

You don't need a computer to tell a 700R4 to lock up. You can do it via pushbutton (since you're going to a manual valvebody you might as well) or do it the old fashioned way--vacuum switches.

It's going to cost around $900 to get a 700R4 beefed up and rebuilt plus you have to find an output shaft. A manual valvebody with compression braking will cost around $250.

I thought your truck was the beginning of the NV4500s, apparently not, eh? You can find one for around $1500-$2500 at a junkyard that is ready to go.
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post #5 of (permalink) Old 01-29-2004, 01:16 PM
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Re: 5 speed for a 700R4 project

Forgive me and correct me if I wrong but isn't a 700R4 a pile of crap??? And basically a outdated macanical 4l60e?
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post #6 of (permalink) Old 01-29-2004, 01:47 PM
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Re: 5 speed for a 700R4 project

The 4L60e didn't get stronger internals until 1999 at which time it got new planetaries. Other than the valve body, it is essentially the same as the 89-91 700R4. The 86-88 700R4 is weaker, followed by the 81-85 being the girliest.

To my knowledge, there is no benefit to having the computer shift the transmission. This is especially true if you can adjust your throttle valve yourself.

4L60e and the 4L60 both suffer from the same problems a 700R4 does. So, technically, 98 and older 4L60es are outdated pieces of [bleep] too, only they need a brainbox to shift them. To me, that means they're even ****tier because that's one more thing to go wrong and leave you stranded.
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post #7 of (permalink) Old 01-29-2004, 07:45 PM
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Re: 5 speed for a 700R4 project

Stick with a manual tranny. I only got 20k miles out of my 4L80e with a 454 and 38s. When my tranny was rebuilt it cost around 3k. A 700r4 probably wont last as long as mine did. What tires and gears will you be running?
post #8 of (permalink) Old 01-30-2004, 12:46 AM
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Re: 5 speed for a 700R4 project

I don't consider the 700 crappy first off. Yes, it has some weaknesses, but I believe properly built it will suit me. I don't do hardcore stuff. I stick mainly to mud, and some trails when I am out in the goo. I run 33x13.50 Super Swamper LTBs and 3.73 gears by the way. I can't afford a NV4500. I checked out prices, and around here in Mississippi, they are going for about 2500. That price is with it needing to be rebuilt. My uncle is a transmission builder, so no cost in building the tranny, just parts. I am VERY set on getting rid of a 5 speed, if I can't have the NV4500. Well, any other suggestions about crossmembers , driveshafts ,etc? Oh by the way, can you tell me when I look at the tranny on if I can tell if I can change the shafts on it to make it work with my 4wd? Will I need to change anything with my transfer case?
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