bolt patterns for tranny
Thread Starter
Junior Member
Joined: Mar 2001
Posts: 3
Likes: 0
From: Winthrop, MN
bolt patterns for tranny
I have an 89 iroc with a 350 tpi that the tranny went out on, I've been calling around to get a tranny from a junk yard for it but no one has one for a 350. I asked someone why a 305 th700-r4 wouldnt fit and he said the bolt patterns were different. Would i be able to drill new holes to be able to bolt up one from a 305? and I was also thinking about buying a 5-speed set up but a web page i went to said that 350's diddnt come with a 5-speed because of emission problems, so woulndt i have to make new holes for that to if i could?
------------------
stock 89 Iroc tpi
------------------
stock 89 Iroc tpi
Moderator
Joined: Jul 1999
Posts: 17,262
Likes: 168
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
They're probably talking about the flex plate. The 305 should have the small flex plate and the torque converter bolts from a 350 won't line up. A dual bolt patter flex plate will fix that problem.
As for bell housing bolts, All SBC have the same bellhousing bolt pattern.
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season
Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662
Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
As for bell housing bolts, All SBC have the same bellhousing bolt pattern.
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season
Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662
Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
Joined: Dec 1999
Posts: 3,544
Likes: 19
From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
no the 350 and 305 700r4 are excactly the same same converter same fly wheel. the only thing I would do is get one from an 88 and up 3rd gen although caprices will work too they use differant springs and possiably differant shift points.
Joined: Dec 2000
Posts: 2,341
Likes: 151
From: Cincinnati,Ohio
Car: 1991 BandittII Firebird
Engine: 5.7 HSR
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
the 91-92 700R4's are alot stronger than the older ones so i would go with one of those
------------------
1991 banditt2 #130 of 600
Project 350 Banditt
<A HREF="http://clubs.yahoo.com/clubs/streetdawgracing" TARGET=_blank>
http://clubs.yahoo.com/clubs/streetdawgracing</A>
http://y42.photos.yahoo.com/tonysams72.
http:/discussion-board.com/GreaterCincinnatiFBodyAssociation
------------------
1991 banditt2 #130 of 600
Project 350 Banditt
<A HREF="http://clubs.yahoo.com/clubs/streetdawgracing" TARGET=_blank>
http://clubs.yahoo.com/clubs/streetdawgracing</A>
http://y42.photos.yahoo.com/tonysams72.
http:/discussion-board.com/GreaterCincinnatiFBodyAssociation
Thread
Thread Starter
Forum
Replies
Last Post
UltRoadWarrior9
Transmissions and Drivetrain
3
Sep 2, 2015 08:24 PM
