700R4 Swap

[76_Scottsdale]

I finally scraped up enough dough to do my 700R4 swap. I'm swaping in a 700R4 in place of my Sm465, and keeping the NP205. I ordered the tranny and all the parts from www.bowtieoverdrives.com on the 21st. Hopefully everything should be here by October 1st and I can start putting it in. I started yesterday by tearing out my exhaust. Tomorrow I'll start tearing out the old tranny and clutch pedal and other misc. stuff. I'll be sure to post some more pics when I start putting it in. Any help would be much appreciated! Thanks again.

[76_Scottsdale]

Well the new tranny came in today. It came so fast I haven't even had time to finish taking out the old one. I'll post some pics later.

PS Anyone interested in purchasing a very nice chrome shifter rod for a SM465 or an entire very good condition newly rebuilt SM465?

[76_Scottsdale]

Does anyone know exactly how much longer a the 700R4 is than the SM465, ie how far will the crossmember actually be moved back?

[KojaK 79k10]

you can measure the crossmember bolt holes in the trans to the front of housing on both and measure the difference in the two. the 700R4 tranny is exactly 23.4 inches in overall length. the SM465 trans is 12 inches in overall length. hope this helps, good luck, I'm curious as to how it turns out, get a picture underneath when finished if you can.

[87GMC2WD]

what exactly is a SM465 trans. im curious into changing my truck over to a stick?

[KojaK 79k10]

the SM465 trans is a cast iron four speed manual with a granny low first gear of 6.55:1. can be found in 68-91 GM trucks. there cheap, short, reliable and parts are easy to come by. if you dont mind shifting then its ONE of GM's best manual transmissions.

[76_Scottsdale]

So if everything's going to get moved back almost 12 inches, is there anyway to modify the NP205 transfer case shifter so that it's not underneath my seat?

[Captkaos]

The 700R4 tranny is exactly 23.4 inches in overall length. the SM465 trans is 12 inches in overall length.

The 12" isn't including the bellhousing with is about 10" long (off the top of my head).

[76_Scottsdale]

So theoreticly the tcase should only be moved back a few more inches. Once I mate the tcase up to the tranny i'll take some measurments so i can trim the shifter hole as needed but this is good because when the tcase is in low it's already close to my seat and i don't want to have take out my bench.

[KojaK 79k10]

you wont have to take out bench. i have checked my 79' and you will definitely have to move the crossmember back but i was just giving overall lengths, sorry didn't mean to confuse you there. you don't have to move back that far. its more time consuming but i assembled trans and tcase together and measured on the ground then the crossmember, you can get a pretty good visual by just looking under your truck. having some form of trans jack also helps more then a bunch of guys because you can position it in up to the motor with the crossmember bolted up to trans.

[76_Scottsdale]

yeah I definitely am going to mate them up on the ground with the crossmember on and raise it up and bolt bellhousing up and then check for squareness on the crossmember, and then drill the holes. thanks for the help. i just got my wisdom teeth cut out today so i won't be starting until sunday at the earliest but i'll be sure to post some pics. Thanks again.

[Boghog]

I'm interested in your 4 speed....my 4 speed in my 84 GMC High Sierra shortbed 4x4 is making lots of noise.....

[Boghog]

Hey 76_scottsdale your PM box is full............

[Boghog]

76_scottsdale how are the shift ratio's on that 4 spd?.....on mine between 2nd and 3rd its very long......meaning when I shift into 3rd the rpm's drop dramatically......

[Captkaos]

So theoreticly the tcase should only be moved back a few more inches. Once I mate the tcase up to the tranny i'll take some measurments so i can trim the shifter hole as needed but this is good because when the tcase is in low it's already close to my seat and i don't want to have take out my bench.

Bench will be in the same spot, the T-case shifter should be in about the same spot too. if that is what you are refereing too.  The crossmember will probably need to move, but as Kojak said, I don't think it is much.