tranny xmmember question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChadMorris · 03-22-2007, 09:38 AM

OK, I finally got my new transmission crossmember in, and the holes on the transmission don't match up with the holes on the crossmember...

Do the 700R4's have different tailpieces? This came out of an 85 vette....

I looked around a little in the FAQ, and found some info, but nothing on different tailpieces, so I thought I would post the question here

Thanks
Chad

I can get pics if needed.....

anyway, off to play golf while I wait for help , life is rough

ChadMorris · 03-23-2007, 08:33 AM

Nobody????? Come on, someone should know something about this.....

Anything.......

even a litttle bit of help.....

Well, going to play golf again, I will check back later...

60-66 Nut · 03-23-2007, 10:41 AM

Chad, I'm not sure if I understand your question. You have to drill the holes in the frame to locate the crossmember correctly, but I'm sure you knew that. If you mean the holes are spaced wider on the trans than on the crossmember, your mount should take care of that. They make a couple of different style mounts. They both bolt to the trans with two bolts, but one has a stud that goes through a single hole in the crossmember and the other uses two bolts that go through the crossmember into the mount. Does that help or did I miss it completely?

60-66 Nut

ChadMorris · 03-23-2007, 01:46 PM

Sorry, should have been clearer...the tranny crossmember is fine...

it is where the tranny bolts to the crossmember that the holes don't line up...

from what info I got, I think I need a new tailpiece..

here are pics

and the bottom of my cab after being undercoated.....

ignore the messy garage.....

Thats how it ends up when my Wife goes to the beach for a week

Chad

60-66 Nut · 03-23-2007, 05:38 PM

I see what you mean now. Yeah, that's got to be a special tail housing for the vette. Forgive me, the last vette I worked on was about 30 years ago. You should be able to just swap the tail housing over to the more common piece, but you may want to check with a trans shop or at least someone more up on vettes. Nice looking job, sure makes me wish I had the time to fool with one of my old trucks. Best of luck.

60-66 Nut

60-66 Nut · 03-23-2007, 05:44 PM

Oh and by the way, when you pull the tail housing off that would be the perfect time to swap the speedometer gears over to mechanical if you haven't done it already, providing of course you are not going to use an electronic speedometer. If you are, then never mind.LOL

60-66 Nut

ChadMorris · 03-23-2007, 10:17 PM

Yep, I will be spending Sat trying to find a tail...try explaining that to your wife on the phone

I have a new set of gauges to put in the truck, so I am sticking with the electronic speedo

Thanks

Chad

**Captainfab** · 03-23-2007, 11:33 PM

I've not had any firsthand experience with a 700R4 out of a Vette, but my son has a 85 IROC that we've worked on a bit. I know it had the boss for a regular tranny mount on the bottom side. All I'm seeing in the pics is the boss for the torque arm to bolt to.....no underside pics. I'll look at one of the tranny's when I'm at the shop tomorrow.

ChadMorris · 03-24-2007, 01:04 AM

Whats the boss? I can get a pic of the underside I guess.....if you want

**Captainfab** · 03-25-2007, 04:01 PM

Quote:

Originally Posted by ChadMorris

Whats the boss? I can get a pic of the underside I guess.....if you want

The boss I'm referring to is what is seen in the first pic. That part of the tailshaft housing on the passenger side with the holes going vertical, That is what I believe the torque arm bolts to, unless the corvette uses some wierd setup for the mount. I looked on the 700R4 out of my son's 85 IROC and the tranny mount actually bolts to the main housing just behind the pan. If yours doesn't have this then I'm not sure that a different tailshaft housing is gonna fix your problem. But then again I'm not a tranny expert. I'll see if I can drag that tranny out and get a pic if it will help.

Iron-Butt · 03-27-2007, 03:39 AM

Is that an after market cross member?

ChadMorris · 03-27-2007, 08:51 AM

yes, I bought a kit from Performance products that included the crossmember and the motor mounts.....

60-66 Nut · 03-27-2007, 10:34 AM

Chad, Captainfab brought up a good point. The more I think about it, I believe in most applications the 700 and 4L60 have the rear mount bolted to the main case and not to the tail housing. There are some aftermarket tail housings that have a mounting boss on them, but if you can move your crossmember far enough forward you should be able to bolt your mount to the case. This is providing, of course, that the vette main case has the holes in it.

60-66 Nut

ChadMorris · 03-27-2007, 12:17 PM

I'l go check now, I'm not doing nothing but surfing the 'net

ChadMorris · 03-27-2007, 12:20 PM

Nope, no mounting holes or brackets that I can see.......

**Captainfab** · 03-27-2007, 11:48 PM

Quote:

Originally Posted by ChadMorris

Nope, no mounting holes or brackets that I can see.......

Well then you might be stuck with fabbing a bracket that will bolt to what is available on the tailshaft housing that you can bolt a tranny mount to. After seeing and reading this thread, I'm curious what is used in the Vette. You might try posting in the 'Engine and Drivetrain' forum, maybe someone that frequents that forum has an answer.

Dice · 03-30-2007, 07:01 PM

Your tranny came out of a C4 Corvette (84-96) and they didn't use a crossmember. They had a long aluminum brace that locked it solid to the third member. The rearend was independent, so the third member didn't move. I had trouble doing the exact opposite swap---installing a turbo 350 into a '84 Vette. I had to do some weird swapping to get that funky tailhousing onto a turbo 350 so I could bolt on the aluminum brace.

03-22-2007, 09:38 AM	#1
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	tranny xmmember question? OK, I finally got my new transmission crossmember in, and the holes on the transmission don't match up with the holes on the crossmember... Do the 700R4's have different tailpieces? This came out of an 85 vette.... I looked around a little in the FAQ, and found some info, but nothing on different tailpieces, so I thought I would post the question here Thanks Chad I can get pics if needed..... anyway, off to play golf while I wait for help , life is rough __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-23-2007, 08:33 AM	#2
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? Nobody????? Come on, someone should know something about this..... Anything....... even a litttle bit of help..... Well, going to play golf again, I will check back later... __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-23-2007, 10:41 AM	#3
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	Re: tranny xmmember question? Chad, I'm not sure if I understand your question. You have to drill the holes in the frame to locate the crossmember correctly, but I'm sure you knew that. If you mean the holes are spaced wider on the trans than on the crossmember, your mount should take care of that. They make a couple of different style mounts. They both bolt to the trans with two bolts, but one has a stud that goes through a single hole in the crossmember and the other uses two bolts that go through the crossmember into the mount. Does that help or did I miss it completely? 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

03-23-2007, 01:46 PM	#4
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? Sorry, should have been clearer...the tranny crossmember is fine... it is where the tranny bolts to the crossmember that the holes don't line up... from what info I got, I think I need a new tailpiece.. here are pics and the bottom of my cab after being undercoated..... ignore the messy garage..... Thats how it ends up when my Wife goes to the beach for a week Chad __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-23-2007, 05:38 PM	#5
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	Re: tranny xmmember question? I see what you mean now. Yeah, that's got to be a special tail housing for the vette. Forgive me, the last vette I worked on was about 30 years ago. You should be able to just swap the tail housing over to the more common piece, but you may want to check with a trans shop or at least someone more up on vettes. Nice looking job, sure makes me wish I had the time to fool with one of my old trucks. Best of luck. 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

03-23-2007, 05:44 PM	#6
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	Re: tranny xmmember question? Oh and by the way, when you pull the tail housing off that would be the perfect time to swap the speedometer gears over to mechanical if you haven't done it already, providing of course you are not going to use an electronic speedometer. If you are, then never mind.LOL 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

03-23-2007, 10:17 PM	#7
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? Yep, I will be spending Sat trying to find a tail...try explaining that to your wife on the phone I have a new set of gauges to put in the truck, so I am sticking with the electronic speedo Thanks Chad __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-23-2007, 11:33 PM	#8
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: tranny xmmember question? I've not had any firsthand experience with a 700R4 out of a Vette, but my son has a 85 IROC that we've worked on a bit. I know it had the boss for a regular tranny mount on the bottom side. All I'm seeing in the pics is the boss for the torque arm to bolt to.....no underside pics. I'll look at one of the tranny's when I'm at the shop tomorrow.

03-24-2007, 01:04 AM	#9
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? Whats the boss? I can get a pic of the underside I guess.....if you want __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-27-2007, 03:39 AM	#11
Iron-Butt 454 club Join Date: Oct 2002 Location: Oklahoma Posts: 1,348	Re: tranny xmmember question? Is that an after market cross member? __________________ David 1965 Chevrolet c-10 454 automatic Custom bbw swb. 1965 Chevrolet C-10 swb (Sold) 1963 Chevrolet C-10 6 Cyl automatic with dual exhaust, pb, ps and 17's. R.I.P "I will miss you. 1967 Chevrolet C-10 6 Cyl Custom lwb 1939 Chevrolet Coupe, 350 v8 automatic. 1935 Chevrolet 2 Dr Standard in the works. 2015 Harley Davidson Street Glide. 2023 Chevrolet Stingray Z51 Convertible. I never want to grow up.

03-27-2007, 08:51 AM	#12
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? yes, I bought a kit from Performance products that included the crossmember and the motor mounts..... __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-27-2007, 10:34 AM	#13
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	Re: tranny xmmember question? Chad, Captainfab brought up a good point. The more I think about it, I believe in most applications the 700 and 4L60 have the rear mount bolted to the main case and not to the tail housing. There are some aftermarket tail housings that have a mounting boss on them, but if you can move your crossmember far enough forward you should be able to bolt your mount to the case. This is providing, of course, that the vette main case has the holes in it. 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

03-27-2007, 12:17 PM	#14
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? I'l go check now, I'm not doing nothing but surfing the 'net __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-27-2007, 12:20 PM	#15
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	Re: tranny xmmember question? Nope, no mounting holes or brackets that I can see....... __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

03-30-2007, 07:01 PM	#17
Dice Registered User Join Date: Oct 2006 Location: Texas Posts: 19	Re: tranny xmmember question? Your tranny came out of a C4 Corvette (84-96) and they didn't use a crossmember. They had a long aluminum brace that locked it solid to the third member. The rearend was independent, so the third member didn't move. I had trouble doing the exact opposite swap---installing a turbo 350 into a '84 Vette. I had to do some weird swapping to get that funky tailhousing onto a turbo 350 so I could bolt on the aluminum brace.



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