how many bolts are in your tranny x-member - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jlaird · 09-29-2007, 07:03 PM

My truck last had an auto tranny in it but originally had a manual. I noticed the tranny crossmember only has two bolts holding it in ( in opposite corners) I also noticed that only two line up. There are two holes in each side of the frame and two holes in each side of the crossmember, but like I said, only two line up. So is this normal?

herb101 · 09-29-2007, 07:07 PM

Mine may be too far off to be relevant, but my Blazer (72 4x4, auto) had only two, opposed bolts and both were loose. The X-member has 4 bolts (2 inline on each side) plus two inline on each side on the diagonal 'outriggers' that bolt to the top of the framerail. That put it at 8 total. I had a hole for each of the eight and replaced the missing bolts - took care of a driveline vibration I was chasing.

Herb

dave2953 · 09-29-2007, 07:23 PM

Mine had 8 originally. Two upper and two lower each side. I modified it though, so now it only has the lower bolts for each side.

jlaird · 09-29-2007, 07:47 PM

are we talking about the same crossmember here? The one that the tranny tailshaft bolts to??

herb101 · 09-29-2007, 08:22 PM

Quote:

Originally Posted by jlaird

are we talking about the same crossmember here? The one that the tranny tailshaft bolts to??

In my case it's the transfer case that mounts to it, but same location. The mount itself (with the rubber core) has 2 bolts to the crossmember and 2 to the tranny/t-case.

Herb

here's a link from somewhere online of an aftermarket equivalent. http://www.performanceonline.com/sto...roductid=17818

and here's a stock one (lower right foreground) from some random for-sale ad.

http://seattle.craigslist.org/kit/pts/434922988.html

jlaird · 09-29-2007, 08:31 PM

ok, mine only mounts to the lower frame rail. What do I have? Is this factory? I'm seeing crossmembers that bolt to the upper and lower rail. confused...

herb101 · 09-29-2007, 08:34 PM

On the stock one, the 'wings' that come off and bolt to the top of the rail are removable. Could be that someone was lazy after a trans swap and only bothered with the lower section. Most every car I've had (from GM at least) only had 2 bolts per side and no diagonal brace. All of my GM trucks have had the diagonals.

Herb

jlaird · 09-29-2007, 08:45 PM

ok, that makes sense. the thing I don't get though is why the two holes on each side of the frame do not line up with the holes in the crossmember??

herb101 · 09-29-2007, 08:52 PM

How far from original is your truck? Motor swaps (6 to 8) tranny swaps (stick to auto or vice-versa) may account for the alignment issues. Do you have two holes on each side that DO line up with the cross-member (if you ignore the trans mount location)? The motor mounts can also be set in 2 different locations, which will push or pull the rest of the drivetrain along...

Herb

Spray-Bomb · 09-29-2007, 09:15 PM

1

**jerry moss** · 09-29-2007, 10:06 PM

should have 8 total, 4 per side. 2 on top and 2 on the bottom of each frame rail.

PanelDeland · 09-29-2007, 10:14 PM

To further complicate matters the length of the tailshaft on the tranny changes stuff also.Long or short 350 is 6 or 9 in. making a 3 in difference.

jlaird · 09-30-2007, 01:24 AM

ok, thanks for the replies. Tomorrow (today i guess) I'm gonna take a pic of it so maybe you guys can tell me exactly what i've got.

jlaird · 09-30-2007, 09:36 AM

Here are some pics. To summarize only one bolt hole on each side of the crossmember lines up, so I'm trying to figure out if this is not a stock crossmember. I've tried all hole locations and no two holes will line up.

teeitup · 09-30-2007, 10:27 AM

I got a stocK AT crossmember out, I'll try to get a pic for you today.

teeitup · 09-30-2007, 10:40 AM

Here ya go

**jerry moss** · 09-30-2007, 10:51 AM

looks like you have the lower portion only. it should look like the one in the pic Randy posted.

09-29-2007, 07:03 PM	#1
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	how many bolts are in your tranny x-member My truck last had an auto tranny in it but originally had a manual. I noticed the tranny crossmember only has two bolts holding it in ( in opposite corners) I also noticed that only two line up. There are two holes in each side of the frame and two holes in each side of the crossmember, but like I said, only two line up. So is this normal?

09-29-2007, 07:07 PM	#2
herb101 Used Register Join Date: May 2005 Location: Live Oak, TX Posts: 379	Re: how many bolts are in your tranny x-member Mine may be too far off to be relevant, but my Blazer (72 4x4, auto) had only two, opposed bolts and both were loose. The X-member has 4 bolts (2 inline on each side) plus two inline on each side on the diagonal 'outriggers' that bolt to the top of the framerail. That put it at 8 total. I had a hole for each of the eight and replaced the missing bolts - took care of a driveline vibration I was chasing. Herb

09-29-2007, 07:23 PM	#3
dave2953 Dave's not here, man Join Date: Jun 2004 Location: Winder, Georgia Posts: 2,000	Re: how many bolts are in your tranny x-member Mine had 8 originally. Two upper and two lower each side. I modified it though, so now it only has the lower bolts for each side. __________________ - 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250

09-29-2007, 07:47 PM	#4
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	Re: how many bolts are in your tranny x-member are we talking about the same crossmember here? The one that the tranny tailshaft bolts to??

09-29-2007, 08:31 PM	#6
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	Re: how many bolts are in your tranny x-member ok, mine only mounts to the lower frame rail. What do I have? Is this factory? I'm seeing crossmembers that bolt to the upper and lower rail. confused...

09-29-2007, 08:34 PM	#7
herb101 Used Register Join Date: May 2005 Location: Live Oak, TX Posts: 379	Re: how many bolts are in your tranny x-member On the stock one, the 'wings' that come off and bolt to the top of the rail are removable. Could be that someone was lazy after a trans swap and only bothered with the lower section. Most every car I've had (from GM at least) only had 2 bolts per side and no diagonal brace. All of my GM trucks have had the diagonals. Herb

09-29-2007, 08:45 PM	#8
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	Re: how many bolts are in your tranny x-member ok, that makes sense. the thing I don't get though is why the two holes on each side of the frame do not line up with the holes in the crossmember??

09-29-2007, 08:52 PM	#9
herb101 Used Register Join Date: May 2005 Location: Live Oak, TX Posts: 379	Re: how many bolts are in your tranny x-member How far from original is your truck? Motor swaps (6 to 8) tranny swaps (stick to auto or vice-versa) may account for the alignment issues. Do you have two holes on each side that DO line up with the cross-member (if you ignore the trans mount location)? The motor mounts can also be set in 2 different locations, which will push or pull the rest of the drivetrain along... Herb

09-29-2007, 09:15 PM	#10
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: how many bolts are in your tranny x-member 1 __________________ Just not low enough... ----------------------------- Sinister Killer

09-29-2007, 10:06 PM	#11
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,946	Re: how many bolts are in your tranny x-member should have 8 total, 4 per side. 2 on top and 2 on the bottom of each frame rail. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

09-29-2007, 10:14 PM	#12
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: how many bolts are in your tranny x-member To further complicate matters the length of the tailshaft on the tranny changes stuff also.Long or short 350 is 6 or 9 in. making a 3 in difference. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

09-30-2007, 01:24 AM	#13
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	Re: how many bolts are in your tranny x-member ok, thanks for the replies. Tomorrow (today i guess) I'm gonna take a pic of it so maybe you guys can tell me exactly what i've got.

09-30-2007, 09:36 AM	#14
jlaird Senior Member Join Date: May 2004 Location: johnstown, NY Posts: 2,393	Re: how many bolts are in your tranny x-member Here are some pics. To summarize only one bolt hole on each side of the crossmember lines up, so I'm trying to figure out if this is not a stock crossmember. I've tried all hole locations and no two holes will line up.

09-30-2007, 10:27 AM	#15
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	Re: how many bolts are in your tranny x-member I got a stocK AT crossmember out, I'll try to get a pic for you today. __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

09-30-2007, 10:40 AM	#16
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	Re: how many bolts are in your tranny x-member Here ya go Attached Images __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"



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09-30-2007, 10:51 AM	#17
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,946	Re: how many bolts are in your tranny x-member looks like you have the lower portion only. it should look like the one in the pic Randy posted. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

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