auto tranny crossmember questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevybill · 11-03-2005, 08:24 PM

I am using a nv 3500 5 speed in my 70 c 10 with an automatic tranny crossmember. The mount holes will align really well. My question is does the end sections of the crossmember go inside the frame rails? And does the mount face toward the front of the truck and on the bottom -even with the bottom part of the frame rails? It looks like the metal side of the mount pad attaches to the transmission and then the rubber side of the mount pad goes against the crossmember. Does this sound right. I plan on using the mount just as if the tranny were an automatic.

If anyone has pics of the crossmember (automatic) mounted along with the tranny that would be great.

If I have not been clear please let me know and I will try to better explain.

thanks for all the great advice.
the crossmember i am using is from www.performanceonline.com
sorry to be so

dwaite72lnghrn · 11-03-2005, 08:47 PM

To dark to take pictures but the cross-member on mine is inside between the rails. I am not sure if a C30 is the same but it should be. Mine has the angle supports from the top to the bottom. The trans mount is wide section steel to the trans and the small rubber incased section to the support.
If I am not mistaken the 4wd had it mounted to the bottom of the frame.

matthufham · 11-03-2005, 10:47 PM

i just painted mine today. it goes inside the frame rails, and there should be an upper and lower flange to bolt to the frame, but my previous owner took a torch to the top flanges... so i'm left with the lower flanges. also, here's the trans mount.

chevybill · 11-04-2005, 08:13 PM

thanks for the pics, any one else got some other pics?

dwaite72lnghrn · 11-05-2005, 11:57 AM

Here are a couple of pics, th400 in a longhorn trans mount. The rear rubber mount, and a manual 4x4.

shifty · 11-07-2005, 01:31 AM

Just for reference, Energy Suspension makes an excellent replacement tranny mount for that setup. Part number 3-1108.

http://store.summitracing.com/partde...=KeywordSearch

$20. Summit is great to deal with.

I have a picture of the xmember, but it's not quite the same (or I'd post it). The NV4500 uses a different bottom brace than the auto or 3spd.

chevybill · 11-07-2005, 09:22 AM

thanks for the additional pics

elf w/capital T · 03-05-2014, 08:12 PM

for a nv3500 swap...anyone have photos and which mount they used with any AFTERMARKET crossmembers?? and using the stock auto crossmember, which mount did you use??

11-03-2005, 08:24 PM	#1
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	auto tranny crossmember questions I am using a nv 3500 5 speed in my 70 c 10 with an automatic tranny crossmember. The mount holes will align really well. My question is does the end sections of the crossmember go inside the frame rails? And does the mount face toward the front of the truck and on the bottom -even with the bottom part of the frame rails? It looks like the metal side of the mount pad attaches to the transmission and then the rubber side of the mount pad goes against the crossmember. Does this sound right. I plan on using the mount just as if the tranny were an automatic. If anyone has pics of the crossmember (automatic) mounted along with the tranny that would be great. If I have not been clear please let me know and I will try to better explain. thanks for all the great advice. the crossmember i am using is from www.performanceonline.com sorry to be so __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint Last edited by chevybill; 11-03-2005 at 08:26 PM.

11-03-2005, 08:47 PM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: auto tranny crossmember questions To dark to take pictures but the cross-member on mine is inside between the rails. I am not sure if a C30 is the same but it should be. Mine has the angle supports from the top to the bottom. The trans mount is wide section steel to the trans and the small rubber incased section to the support. If I am not mistaken the 4wd had it mounted to the bottom of the frame. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-03-2005, 10:47 PM	#3
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: auto tranny crossmember questions i just painted mine today. it goes inside the frame rails, and there should be an upper and lower flange to bolt to the frame, but my previous owner took a torch to the top flanges... so i'm left with the lower flanges. also, here's the trans mount. Attached Images Last edited by matthufham; 11-04-2005 at 08:48 PM.

11-04-2005, 08:13 PM	#4
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	Re: auto tranny crossmember questions thanks for the pics, any one else got some other pics? __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

11-05-2005, 11:57 AM	#5
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: auto tranny crossmember questions Here are a couple of pics, th400 in a longhorn trans mount. The rear rubber mount, and a manual 4x4. Attached Images __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

11-07-2005, 01:31 AM	#6
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	Re: auto tranny crossmember questions Just for reference, Energy Suspension makes an excellent replacement tranny mount for that setup. Part number 3-1108. http://store.summitracing.com/partde...=KeywordSearch $20. Summit is great to deal with. I have a picture of the xmember, but it's not quite the same (or I'd post it). The NV4500 uses a different bottom brace than the auto or 3spd. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

11-07-2005, 09:22 AM	#7
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	Re: auto tranny crossmember questions thanks for the additional pics __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

03-05-2014, 08:12 PM	#8
elf w/capital T Registered User Join Date: Feb 2011 Location: North Carolina Posts: 994	Re: auto tranny crossmember questions for a nv3500 swap...anyone have photos and which mount they used with any AFTERMARKET crossmembers?? and using the stock auto crossmember, which mount did you use?? Last edited by elf w/capital T; 03-05-2014 at 08:13 PM. Reason: forgot a keyword

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