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#1 |
Registered User
Join Date: May 2000
Location: Storm Lake, Ia
Posts: 1,449
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Which hole do I put it in?
Got a 3/4 ton longhorn with th400 tranny and it originally had a 402.
Now I am putting it back together and using a 350 engine. The tranny crossmember was in the midlle poisition of holes. Do I need to move it(tranny crossmember) forward to the front holes for the 350 engine?If I do this will the drive shaft lenght still be ok or did they make a different driveshaft for the 350/400 combo compared to the 402/400 combo? Got the cab off so I can't use that as a reference. Will be using HEI so I don't want to be to tight on firewall. Also want the 350 fan shroud to line up right. Thanks
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#2 |
Registered User
Join Date: Oct 2002
Location: Iowa
Posts: 71
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oh, you're talking about your truck... I saw the title and thought, well, nevermind.......... I can't really help you on this one.
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#3 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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the 350/400 combo is mounted foward from the 402/400 , when using the fact SB stands. I couldnt say just how much, but it will affect the lenght of the D shaft. My 383/400 is mounted in 6/250 position, so I cant helptoo much on bolt spacing. Good luck,crazyL
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#4 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,139
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Ask Desert Rat. Look him up in members and e-mail him. He can most likely answer your ?
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#5 |
Registered User
![]() Join Date: Aug 2001
Location: SOMERSET KY.
Posts: 6,427
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#6 |
Registered User
Join Date: May 2001
Location: Benbrook, TX
Posts: 1,060
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fits good in both!
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69 swb stepside, rebuild and upgrade in progress |
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#7 |
Progress = 0%
Join Date: Nov 2001
Location: Kansas City, MO
Posts: 2,108
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I'd try the front hole first and if all goes well, try the rear one....... just take it nice and slow. Don't wanna force it!
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Jason - '67 GMC swb | '57 Bel-Air 4dr hardtop | '56 210 4dr Wagon | 2000 GMC Sierra |
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#8 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,770
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Engine, front set of holes with small block frame towers and transmission crossmember goes in the same holes that they were in for the big block if I remember write. If I were you I wouldn't bolt the tranny crossmember untill after the transmission is installed, then the crossmember will align itself in the correct holes. Just a thought, thats what I do. Also if that is a 72 Longhorn, I would trade you some cash and a set of small block V-8 frame towers for the Big Block ones. Let me know if you are interested. WES www.ClassicHeartbeat.com
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
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#9 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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OK.....I have 3 sets of bolt holes on the frame of my longhorn for the auto trans crossmember. As far as I know(i could be off on this), the longhorns only came with either a 400 turbo , or a 4spd. the 4 spd did not have a crossmember under the trans(bell mount). My 383 is mounted in I 6 position, & uses the rear set of holes(short tail 400 turbo, just like factory). If you use the front set of holes , you are V8 SB position(factory position & stands). There are 3 1/2 " difference from fact V8 SB, & I 6 position. I havent done a BB swap(not Chev anyway), but assume that the other set of holes are for the BB(SB ,foward holes......I6 rear holes,& BB in between).......my thoughts are that the BB is set back from SB location(a couple inches), to help with the extra lenght on the nose. The measure from the eng mount, to the bell is the same distance on the SB as it is on the BB, so you should be able to use any of the sets of holes to mount(provided that the parts clear the firewall. To the best of my knowledge, this info is correct....... crazyL
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#10 |
Registered User
Join Date: Jan 2003
Location: Kelowna B.C. Canada
Posts: 2,048
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That sounds like a hole lot of lovin going on Couldn't help it sorry lol
Last edited by casey; 03-09-2003 at 03:09 AM. |
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