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Old 08-09-2021, 08:31 PM   #1
Matt's k5
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GMC v6 5 speed

I know it's probably been done but can't see where anyone has on here with a GMC v6 I'm planning on installing a t5 from a 89 s10 in my 62 305 v6 and using the astro clutch and modifying the clutch disc or jeep input shaft, just wondering has anyone done the with there v6? Seeing how gmc uses there own flat disc unique I'll post as I go , looking to cruise faster than 55
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Old 08-09-2021, 08:41 PM   #2
Clyde65
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Re: GMC v6 5 speed

I have seen a 700r4 matted to a V6, 305 I think.
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Old 08-09-2021, 09:59 PM   #3
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Re: GMC v6 5 speed

Quote:
Originally Posted by Clyde65 View Post
I have seen a 700r4 matted to a V6, 305 I think.
Yes Jacob did that and I'm doing my other truck with a 700r4 but keeping this one a manual finally found a t5
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Old 08-10-2021, 12:29 AM   #4
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Re: GMC v6 5 speed

I've been wanting to do some sort of 5 speed swap in my 3/4 ton as well. In for the build
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Old 08-10-2021, 09:30 AM   #5
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Re: GMC v6 5 speed

Not having a V6 I have not investigated the differences, but here is some info on T5's, hope it helps - https://lugnutz65chevystepside.weebl...his-first.html

Last edited by The Rocknrod; 08-10-2021 at 01:53 PM.
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Old 08-10-2021, 12:50 PM   #6
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Re: GMC v6 5 speed

I love my T5 on the 283 dont know about the 305 conversion.
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Old 08-10-2021, 05:01 PM   #7
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Re: GMC v6 5 speed

Matt,

I did not do the 5 speed but, I did a New Process MY6 NP440 4 speed overdrive. I followed the article from Classic Trucks which was written by Brad54 (I think that's his Name from the forum).

It bolted on just fine. I only had to have the input bearing turned down and have a new driveshaft made. It replaced my SM420.

The overdrive is .73 and pretty well suited to the V6 I feel.

They can be tough to find and you need to get a complete unit with the shifter and rods and mounting bracket.


Another possible option on a 5 speed is the AX15

http://www.67-72chevytrucks.com/vboa...highlight=ax15
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Old 08-10-2021, 11:52 PM   #8
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Re: GMC v6 5 speed

Yeah I've looked all over for a my6 no luck.i even talked to you a few times about it, so I finally found a t5 so I'm going that route .79 overdrive on the t5 just wondering.if I'm.the first one to do it on the v6 just waiting for the astro clutch to come in them I'll.have to modify the disc I'm sure , I already pre fit the trans to bellhousing fits nice onto the pilot bearing just need to trim.the collar
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Old 08-10-2021, 11:53 PM   #9
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Re: GMC v6 5 speed

Musicman what rpm you spinning at 75mph?
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Old 08-11-2021, 03:45 PM   #10
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Re: GMC v6 5 speed

I recall only doing about 70mph and the tach was reading about 25-2700rpms. The redline on these engines are about 3400rpms so I had room to push it if I wanted to.
I'm looking forward to your swap and seeing the results, should be fun.
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Old 08-11-2021, 09:53 PM   #11
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Re: GMC v6 5 speed

Well the clutch came in it's AutoZone (don't know if I trust it may order a luk.one) but looks like will bel fine! Plenty of room against the flywheel disc sits flat on it! Test fitted on my spare engine plenty of room for the bearing ,had to take off 1/2 inch from the collar is all, I think it will work the hard part is gonna be the driveline because this truck is a short bed and x frame, I'll cross that bridge when I come to it! Here are some pics
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Old 08-12-2021, 06:39 AM   #12
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Re: GMC v6 5 speed

Really like your truck Matt, I would imagine the driving experience with the 5 speed will be a revelation.

P.
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Old 08-12-2021, 12:22 PM   #13
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Re: GMC v6 5 speed

Great work Matt, glad to see your moving forward.
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Old 08-22-2021, 10:58 AM   #14
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Re: GMC v6 5 speed

Right on ! Im sure you will like the swap.. well worth the effort. Drive shaft shouldn't be an issue. My 60 is a long bed with a one piece driveshaft. I had it cut down at a local shop , no issues with the X- frame or driveshaft tunnel. Keep it up !
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Old 08-24-2021, 01:34 AM   #15
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Re: GMC v6 5 speed

All in just waiting on fluid, driveline turned out to be easy , my truck is a short bed , needed a 52 inch driveline for the next guy doing it. go to the wrecking yard find a 98-2003 Chevy /GMC s10 blazer 4 door make sure it's 2 wheel drive and the driveline fits perfectly! Just needed a conversion u joint I'll.update after the test drive, I also added a gps speedometer and vintage rpm tach turned out Cool IMHO
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Old 08-24-2021, 11:10 AM   #16
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Re: GMC v6 5 speed

Great Job and thanks for providing those other details on the driveshaft. Love how the dash with gauges looks!
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Old 08-24-2021, 09:00 PM   #17
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Re: GMC v6 5 speed

nice write up
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Old 08-25-2021, 10:24 AM   #18
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Re: GMC v6 5 speed

Nice info on the drive line! Thank you... looking forward to future work here
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Old 09-04-2021, 10:15 PM   #19
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Re: GMC v6 5 speed

All done cruising freeway at 2k rpm love it!. Used the ol shifter waiting for a rubber mat, also fixed the floor holes and new cab mounts
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57 ford fairlane (dad's car never got to it before he passed away R.I.P I LOVE YOU DAD.)
62 GMC 305 V6 custom L/B
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71 K5 MAMMA'S RIDE!
63 GMC 4X4 305 V6
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Old 09-05-2021, 04:46 AM   #20
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Re: GMC v6 5 speed

Quote:
Originally Posted by Matt's k5 View Post
All done cruising freeway at 2k rpm love it!. Used the ol shifter waiting for a rubber mat, also fixed the floor holes and new cab mounts
Looks good. I took my shifter knob to a trophy awards shop had them laser etch the 5 speed pattern in an old knob that was very worn.
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