drive shaft question

[jbristo67]

My truck came stock with a muncie 4 speed. Well thats the last transmission that was in it any way. I am going to run a 700 R4. Do I need to get a new drive shaft or can i change the front yoke or do I have to do anything besides just hook it up

[jbristo67]

anyone???

[VetteVet]

The 200-4R overdrive trans has a 27-spline TH-350-style output shaft and is commonly found in ’81-’90 Chevy Monte Carlos, Malibus, El Caminos and Impalas. These transmissions are durable enough to withstand the punishment of the legendary turbo Buick Grand National from the factory. The 200-4R measures 27.75 inches, with a 26.81-inch mount position. To swap with the ’Glide, the crossmember must be moved back 6 inches. The good news is that the driveshaft will not have to be shortened.

The 700-R4 is the larger cousin of the 200-4R. It changed its name in the early ’90s to 4L60, but the internals remained the same. This trans is a four-speed O/D unit with a 27-spline output shaft. Overall length is 30 inches.Corvette versions have no provisions for a crossmember mount because of their driveline torque tube design, but can be exchanged for a different extension housing that has a mount provision. To switch a Powerglide to a 700-R4, use the ’Glide’s 27-spline output shaft, shorten the driveshaft 2.75 inches, and slide the crossmember back 1-¼ inches.


Manual Transmissions


The Muncie is an aluminum case four-speed transmission introduced in 1963. Interestingly, there are two distinct versions of the Muncie that many Bow Tie enthusiasts may not be aware of. With a 10-spline input shaft and a 27-spline output shaft, the early Muncie was less durable than the ’71-and-later models with its 26-spline input and 32-spline output shaft. The Muncie came in three flavors: the M20, M21, and M22 (the Rock Crusher). Many think all fine-spline Muncies are Rock Crushers, which is not the case. After 1971, all Muncies were fine splined. The M22 was a rare model offered in supercars like the ’67 427/430hp Corvette. Because owners of these cars rarely part them out, the likely available transmissions will be the M20 and M21.

The primary difference between the M20 and M21 models is their gear ratios. The ’71 M20 wide-ratio transmission has a 2.54:1 First gear ratio and the M21 close-ratio has a 2.20. The early Muncies have an overall length of 21.5 inches and a case-to-trans mount measurement of 14 inches. To swap in a pre-’71 M20, M21, or pre-’70 M22 for a ’Glide, add 6-½ inches to the total length to account for the bellhousing, making the total length of the trans 28 inches and 20.5 inches to the mount. Using the ’Glide slip-yolk, move the crossmember forward ¼ inch.

In 1970, the M22 for Chevelles was lengthened to 22.25 inches and the M20 and M21 followed suit in 1971. Adding the bellhousing length of 6 1/2 inches gives an overall length of 28.75 inches.

To summarize all this, The output splines are 27 for the automatics and 32 for the Muncies, so you will have to change the front yoke of the driveshaft.
The overall lengths are the same for the 2004r and the muncie but the 700 is 30 inches so the driveshaft would have to be shortened 1.5 inches for it.
There are variables for all this so these are not set in stone. The engine position, size,type, and body style of the truck, as well as one-piece or two-piece drive shaft are all factors. None of which you bothered to mention in your OP.
Here is the website I got this info from.

http://www.chevyhiperformance.com/te...ech/index.html

[tdave00]

I just pulled my powerglide and got a 700r4. I have heard the driveshaft from an early 90's pickup (that has a 700r4) will work fine. I lucked up and found another board member that had an extra driveshaft to work with my 700r4.

Check this thread. That's what I was referring to, but TXFirefighter explains it much better.
http://67-72chevytrucks.com/vboard/s...0&postcount=19

[jbristo67]

Originally Posted by tdave00

I just pulled my powerglide and got a 700r4. I have heard the driveshaft from an early 90's pickup (that has a 700r4) will work fine. I lucked up and found another board member that had an extra driveshaft to work with my 700r4.

Check this thread. That's what I was referring to, but TXFirefighter explains it much better.
http://67-72chevytrucks.com/vboard/s...0&postcount=19

Thanks man you were a big help

[70clone]

I used the drive shaft out of a 1993 swb with the 700r4 perfect match u will need to by a cross joint