GMC v6 5 speed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Matt's k5** · 08-09-2021, 08:31 PM

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

**Clyde65** · 08-09-2021, 08:41 PM

I have seen a 700r4 matted to a V6, 305 I think.

**Matt's k5** · 08-09-2021, 09:59 PM

Quote:

Originally Posted by Clyde65

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

TJ's Chevy · 08-10-2021, 12:29 AM

I've been wanting to do some sort of 5 speed swap in my 3/4 ton as well. In for the build

**The Rocknrod** · 08-10-2021, 09:30 AM

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

**sirJim** · 08-10-2021, 12:50 PM

I love my T5 on the 283 dont know about the 305 conversion.

**MusicMan70** · 08-10-2021, 05:01 PM

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

**Matt's k5** · 08-10-2021, 11:52 PM

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

**Matt's k5** · 08-10-2021, 11:53 PM

Musicman what rpm you spinning at 75mph?

**MusicMan70** · 08-11-2021, 03:45 PM

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.

**Matt's k5** · 08-11-2021, 09:53 PM

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

Paul Y · 08-12-2021, 06:39 AM

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

P.

**The Rocknrod** · 08-12-2021, 12:22 PM

Great work Matt, glad to see your moving forward.

**slepysal** · 08-22-2021, 10:58 AM

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 !

**Matt's k5** · 08-24-2021, 01:34 AM

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

**MusicMan70** · 08-24-2021, 11:10 AM

Great Job and thanks for providing those other details on the driveshaft. Love how the dash with gauges looks!

**slepysal** · 08-24-2021, 09:00 PM

nice write up

88Stanger · 08-25-2021, 10:24 AM

Nice info on the drive line! Thank you... looking forward to future work here

**Matt's k5** · 09-04-2021, 10:15 PM

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

**sirJim** · 09-05-2021, 04:46 AM

Quote:

Originally Posted by Matt's k5

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.

08-09-2021, 08:31 PM	#1
Matt's k5 BLAZER THIRTY!! Join Date: May 2007 Location: Utah Posts: 324	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 Attached Images __________________ 49 chevy 5 window 20 year project (sold)😟 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 72 HIGHLANDER K5 BLAZER 2nd owner 71 K5 MAMMA'S RIDE! 63 GMC 4X4 305 V6 62 GMC SHORT BED SERVICE BODY V6 (STUMPY) 74 GMC CUSTOM 1500 L/B

08-09-2021, 08:41 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,545	Re: GMC v6 5 speed I have seen a 700r4 matted to a V6, 305 I think. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

08-10-2021, 12:29 AM	#4
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	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 __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

08-10-2021, 09:30 AM	#5
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	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 __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 08-10-2021 at 01:53 PM.

08-10-2021, 12:50 PM	#6
sirJim Senior Member Join Date: Sep 2016 Location: Denmark Posts: 306	Re: GMC v6 5 speed I love my T5 on the 283 dont know about the 305 conversion. __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=737695 62 burb in the making.

08-10-2021, 05:01 PM	#7
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	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 __________________ MusicMan70 1961 GMC Suburban

08-10-2021, 11:52 PM	#8
Matt's k5 BLAZER THIRTY!! Join Date: May 2007 Location: Utah Posts: 324	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 __________________ 49 chevy 5 window 20 year project (sold)😟 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 72 HIGHLANDER K5 BLAZER 2nd owner 71 K5 MAMMA'S RIDE! 63 GMC 4X4 305 V6 62 GMC SHORT BED SERVICE BODY V6 (STUMPY) 74 GMC CUSTOM 1500 L/B

08-10-2021, 11:53 PM	#9
Matt's k5 BLAZER THIRTY!! Join Date: May 2007 Location: Utah Posts: 324	Re: GMC v6 5 speed Musicman what rpm you spinning at 75mph? __________________ 49 chevy 5 window 20 year project (sold)😟 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 72 HIGHLANDER K5 BLAZER 2nd owner 71 K5 MAMMA'S RIDE! 63 GMC 4X4 305 V6 62 GMC SHORT BED SERVICE BODY V6 (STUMPY) 74 GMC CUSTOM 1500 L/B

08-11-2021, 03:45 PM	#10
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	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. __________________ MusicMan70 1961 GMC Suburban

08-11-2021, 09:53 PM	#11
Matt's k5 BLAZER THIRTY!! Join Date: May 2007 Location: Utah Posts: 324	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 Attached Images __________________ 49 chevy 5 window 20 year project (sold)😟 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 72 HIGHLANDER K5 BLAZER 2nd owner 71 K5 MAMMA'S RIDE! 63 GMC 4X4 305 V6 62 GMC SHORT BED SERVICE BODY V6 (STUMPY) 74 GMC CUSTOM 1500 L/B

08-12-2021, 06:39 AM	#12
Paul Y Registered User Join Date: Jul 2013 Location: Essex Posts: 948	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. __________________ Woody's Build - http://67-72chevytrucks.com/vboard/s...d.php?t=658621 If it goes wrong, I blame the Internet...

08-12-2021, 12:22 PM	#13
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: GMC v6 5 speed Great work Matt, glad to see your moving forward. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

08-22-2021, 10:58 AM	#14
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	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 ! __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "

08-24-2021, 01:34 AM	#15
Matt's k5 BLAZER THIRTY!! Join Date: May 2007 Location: Utah Posts: 324	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 Attached Images __________________ 49 chevy 5 window 20 year project (sold)😟 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 72 HIGHLANDER K5 BLAZER 2nd owner 71 K5 MAMMA'S RIDE! 63 GMC 4X4 305 V6 62 GMC SHORT BED SERVICE BODY V6 (STUMPY) 74 GMC CUSTOM 1500 L/B

08-24-2021, 11:10 AM	#16
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: GMC v6 5 speed Great Job and thanks for providing those other details on the driveshaft. Love how the dash with gauges looks! __________________ MusicMan70 1961 GMC Suburban



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08-24-2021, 09:00 PM	#17
slepysal Registered User Join Date: Oct 2006 Location: San Jose NOR*CAL Posts: 3,080	Re: GMC v6 5 speed nice write up __________________ 1960 Apache long bed fleet L6 250 Clifford intake 2 bbl carb. Langdon cast headers with dual exhaust and bellflower tips. T-5 5 speed, power steering and power disc brakes. "Over, Around or through it... "

08-25-2021, 10:24 AM	#18
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,651	Re: GMC v6 5 speed Nice info on the drive line! Thank you... looking forward to future work here __________________ John 3:16 - Saved me... God Bless

09-04-2021, 10:15 PM	#19
Matt's k5 BLAZER THIRTY!! Join Date: May 2007 Location: Utah Posts: 324	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 Attached Images __________________ 49 chevy 5 window 20 year project (sold)😟 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 72 HIGHLANDER K5 BLAZER 2nd owner 71 K5 MAMMA'S RIDE! 63 GMC 4X4 305 V6 62 GMC SHORT BED SERVICE BODY V6 (STUMPY) 74 GMC CUSTOM 1500 L/B

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