Manual Transmission cross member question, Are V8 and I6 Different? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Todd68Chevy** · 09-03-2013, 10:26 PM

Does anybody know the correct answer to : What is the difference between a manual transmission bell housing mount crossmember in a V8 truck and a I6 truck. I know that they would have to be bolted/ riveted in a different place of the frame since the engine sits forward in the V8 but is the cross member just moved or is it actually different. I have one that I think is out of a 1968 C20 V8 truck but trying to verify it. Thanks for any help.

**Todd68Chevy** · 09-05-2013, 01:06 PM

Someone has to know the answer?

**SIXTY9** · 09-05-2013, 01:36 PM

Should be the same, different mount location as you said, also the bellhousing should work on V8

SS Tim · 09-05-2013, 05:44 PM

IIRC there are actually I6, V8 small block and V8 big block versions. Can't tell you the detail differences though.

**Ironhorse** · 09-05-2013, 06:59 PM

Subscribed on this myself. Just removed the same cross member from a '71 stick shift, no SIPD as glove box door is gone but was "told" had a 350 V8 with a Muncie 4 speed car trans behind it.

scott-wisc · 09-05-2013, 08:47 PM

There is a difference, if your engine stands are using the 1st two holes, then it had a V8 and the bellhhousing support is mounted forward. If it's a I6 setup, the back rivet is really close to the cab. The holes won't line up if you try sliding the 6 to the 8 position. Also, the motor will be tilted forward and the crossmember will have an incorrect angle. So far, the difference I've seen is the I6 support has two slots cut out and the V8 doesn't.

scott-wisc · 09-05-2013, 09:06 PM

Todd- Set your support on a level surface and see how much angle there is where it goes inside the frame. I'm thinking if it's for a V8, there should be more angle than the one in the photo below. Notice the feeler gauges used to make the bubble level. This is facing the drivers side.

**Todd68Chevy** · 09-05-2013, 09:51 PM

I am going out of town after work tomorrow so it will be Sunday afternoon before I can check the angle and I will let you know. Thanks

71meangreenc10 · 09-06-2013, 05:12 AM

Well mine wasn't the same.

I changed from a 6 to 8 and the crossmember didnt work. It was the factory one and I had to find a V8 truck and change it out.

Smitty

**Todd68Chevy** · 09-10-2013, 09:35 PM

From what I can tell it takes about 1 1/2 inches to get the level straight on mine. With the bottom sitting on the floor, I measured up to the top flange and it is approx. 10" in the front and 8 1/2" in the rear.

ALA · 02-27-2015, 06:10 PM

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outdoorsman310 · 02-28-2015, 01:22 AM

Not sure about the big block, but the v8 have more of a twist because they are farther up the frame. the I6 crossmembers are more flat. I have a gmc crossmember in my c20. I guess its the same as the v8 mounts because it fit and works correctly.

09-03-2013, 10:26 PM	#1
Todd68Chevy Senior Member Join Date: Oct 2009 Location: Shelburn Indiana Posts: 3,977	Manual Transmission cross member question, Are V8 and I6 Different? Does anybody know the correct answer to : What is the difference between a manual transmission bell housing mount crossmember in a V8 truck and a I6 truck. I know that they would have to be bolted/ riveted in a different place of the frame since the engine sits forward in the V8 but is the cross member just moved or is it actually different. I have one that I think is out of a 1968 C20 V8 truck but trying to verify it. Thanks for any help. Attached Images __________________ Note: All parts I have for sale are also for sale locally. I currently own: 1940 Chevy Fire truck (project), 1946 Chevy truck (project), 1946 Chevy 1 Ton pick up, 1953 Chevy school bus (storage area), 1968 Chevy C10 (I have drove for 26 years), 1994 Chevy C2500 (daily driver), 2005 GMC crew cab K2500 (parts hauler) and more trucks for parts.

09-05-2013, 01:06 PM	#2
Todd68Chevy Senior Member Join Date: Oct 2009 Location: Shelburn Indiana Posts: 3,977	Re: Manual Transmission cross member question, Are V8 and I6 Different? Someone has to know the answer? __________________ Note: All parts I have for sale are also for sale locally. I currently own: 1940 Chevy Fire truck (project), 1946 Chevy truck (project), 1946 Chevy 1 Ton pick up, 1953 Chevy school bus (storage area), 1968 Chevy C10 (I have drove for 26 years), 1994 Chevy C2500 (daily driver), 2005 GMC crew cab K2500 (parts hauler) and more trucks for parts.

09-05-2013, 01:36 PM	#3
SIXTY9 Senior Member Join Date: Jan 2013 Location: North Charleston SC Posts: 503	Re: Manual Transmission cross member question, Are V8 and I6 Different? Should be the same, different mount location as you said, also the bellhousing should work on V8

09-05-2013, 05:44 PM	#4
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Manual Transmission cross member question, Are V8 and I6 Different? IIRC there are actually I6, V8 small block and V8 big block versions. Can't tell you the detail differences though. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

09-05-2013, 06:59 PM	#5
Ironhorse Senior Member Join Date: Jul 2001 Location: Wellington, Ks Posts: 10,143	Re: Manual Transmission cross member question, Are V8 and I6 Different? Subscribed on this myself. Just removed the same cross member from a '71 stick shift, no SIPD as glove box door is gone but was "told" had a 350 V8 with a Muncie 4 speed car trans behind it. __________________ 1971 Chevy 1/2T 4x4 LWB 350 V-8 Was sm465-now 350TH/np205 Tilt, Tach, Towhooks Original Truck AM/FM Wellington, Ks

09-05-2013, 08:47 PM	#6
scott-wisc Registered User Join Date: Feb 2012 Location: Wisconsin Posts: 144	Re: Manual Transmission cross member question, Are V8 and I6 Different? There is a difference, if your engine stands are using the 1st two holes, then it had a V8 and the bellhhousing support is mounted forward. If it's a I6 setup, the back rivet is really close to the cab. The holes won't line up if you try sliding the 6 to the 8 position. Also, the motor will be tilted forward and the crossmember will have an incorrect angle. So far, the difference I've seen is the I6 support has two slots cut out and the V8 doesn't. Attached Images

09-05-2013, 09:06 PM	#7
scott-wisc Registered User Join Date: Feb 2012 Location: Wisconsin Posts: 144	Re: Manual Transmission cross member question, Are V8 and I6 Different? Todd- Set your support on a level surface and see how much angle there is where it goes inside the frame. I'm thinking if it's for a V8, there should be more angle than the one in the photo below. Notice the feeler gauges used to make the bubble level. This is facing the drivers side. Attached Images

09-05-2013, 09:51 PM	#8
Todd68Chevy Senior Member Join Date: Oct 2009 Location: Shelburn Indiana Posts: 3,977	Re: Manual Transmission cross member question, Are V8 and I6 Different? I am going out of town after work tomorrow so it will be Sunday afternoon before I can check the angle and I will let you know. Thanks __________________ Note: All parts I have for sale are also for sale locally. I currently own: 1940 Chevy Fire truck (project), 1946 Chevy truck (project), 1946 Chevy 1 Ton pick up, 1953 Chevy school bus (storage area), 1968 Chevy C10 (I have drove for 26 years), 1994 Chevy C2500 (daily driver), 2005 GMC crew cab K2500 (parts hauler) and more trucks for parts.

09-06-2013, 05:12 AM	#9
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Manual Transmission cross member question, Are V8 and I6 Different? Well mine wasn't the same. I changed from a 6 to 8 and the crossmember didnt work. It was the factory one and I had to find a V8 truck and change it out. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

09-10-2013, 09:35 PM	#10
Todd68Chevy Senior Member Join Date: Oct 2009 Location: Shelburn Indiana Posts: 3,977	Re: Manual Transmission cross member question, Are V8 and I6 Different? From what I can tell it takes about 1 1/2 inches to get the level straight on mine. With the bottom sitting on the floor, I measured up to the top flange and it is approx. 10" in the front and 8 1/2" in the rear. Attached Images __________________ Note: All parts I have for sale are also for sale locally. I currently own: 1940 Chevy Fire truck (project), 1946 Chevy truck (project), 1946 Chevy 1 Ton pick up, 1953 Chevy school bus (storage area), 1968 Chevy C10 (I have drove for 26 years), 1994 Chevy C2500 (daily driver), 2005 GMC crew cab K2500 (parts hauler) and more trucks for parts.

02-27-2015, 06:10 PM	#11
ALA Registered User Join Date: Aug 2013 Location: GREENSBURG PA Posts: 4	Re: Manual Transmission cross member question, Are V8 and I6 Different? Please note that you must be a supporting member to post classified items. This includes but is not limited to What Its Worth, Want To Buy, Want To Trade, and For Sale. Please consider supporting the forum by subscribing. Further information on the subscription levels available are located here Last edited by kcsa75; 02-28-2015 at 12:11 AM.

02-28-2015, 01:22 AM	#12
outdoorsman310 Registered User Join Date: Dec 2014 Location: Newark, De Posts: 58	Re: Manual Transmission cross member question, Are V8 and I6 Different? Not sure about the big block, but the v8 have more of a twist because they are farther up the frame. the I6 crossmembers are more flat. I have a gmc crossmember in my c20. I guess its the same as the v8 mounts because it fit and works correctly.



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