Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN







Search Auto Parts

1968 Chevelle Malibu 4-door transmission swap sizing


  Email This Post



Montus
New User

Feb 19, 2017, 8:38 PM

Post #1 of 7 (210 views)
  post locked   1968 Chevelle Malibu 4-door transmission swap sizing  

I have a 68 Chevelle with a 302dz engine and a hacked in transmission from an Oldsmobile delta 88. I bought the car from a guy who had no idea what was in it, yet lied and claimed it was a 350 engine with a th350 trans. Recently when I was driving on the highway the car began to shake wildly, and my mechanic discovered that the transmission was shot (no further information,I was told by a secondary source). I want to put a th350 in; however, I'm not sure it will fit without some modifications. There is an adapter plate between the transmission and the engine block, but I don't believe it's visible in any of the pictures. Also, the original flexplate on the car was badly cracked, and I'm not entirely sure why, yet I bought a new one and had it installed previous to the the transmission breaking. The drive shaft is pretty tight between the transmission and differential so would a slightly reduced transmission length help? I had slid halfway under the car to get the measurements and tried to be as accurate as possible, but I plan on driving the car home tomorrow to start doing some work on it, so I should be be able to get more measurements then. Also, I included a picture of a part of the drive shaft because it appears that it had been cut and welded, is that from the factory? Essentially I am looking to see if a Chevy th350 will fit inside of my 68 as well as if I can and should reuse the torque converter and new flexplate flywheel (I believe it is a 153 tooth), and if not, what should I buy that would fit between the th350 and 302dz I have? Any help is greatly appreciated, sorry if I stated anything incorrectly, I've only recently started getting into cars.

Pic 1: Poorly Drawn Schematic

Pic 2: Profile of the port side of the transmission

Pic 3 & Pic 4: Torque Converter/Flywheel/Bell Housing Assembly

Pic 5: Close up of a disgraceful shifter linkage

Pic 6: Transmission Oil Pan

Pic 7: Driveshaft/Differential Linkage

Pic 8: Welded Driveshaft?

Pic 9: Tail of transmission w/ size reference.


Code
  










(This post was edited by Hammer Time on Feb 20, 2017, 8:43 PM)


gsferraro
Enthusiast

Feb 20, 2017, 6:29 PM

Post #2 of 7 (173 views)
  post locked   Re: 1968 Chevelle Malibu 4-door transmission swap sizing  

Hello,
This is Gary, i answer the transmission questions, I dont really do conversions to much anymore, but normally you may have to shorten the drive shaft not the output shaft. make sure the cross member will still fit, flywheel may have to be changed to fit the converter(watch for weights on flywheel) and linkage. If there is a powerglide in this car, it already has a vacuum line.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 20, 2017, 8:45 PM

Post #3 of 7 (169 views)
  post locked   Re: 1968 Chevelle Malibu 4-door transmission swap sizing  

Most of your pictures were just way too large for the thread and made it impossible to read so i had to delete them. Please reduce the size if you decide to re-post any.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 20, 2017, 11:23 PM

Post #4 of 7 (164 views)
  post locked   Re: 1968 Chevelle Malibu 4-door transmission swap sizing  

Just a note on this to remember: Oldsmobile in 1968 and model years around this the output shaft DID NOT have the gear or place for a speedometer cable! Olds used the wheel bearing's dust cap from front left wheels! That was so for all TH350s and TH400s that I ever knew of only Olds all other GM divisions used the output shaft,


T



(This post was edited by Tom Greenleaf on Feb 20, 2017, 11:25 PM)


Montus
New User

Feb 21, 2017, 8:56 AM

Post #5 of 7 (154 views)
  post locked   Re: 1968 Chevelle Malibu 4-door transmission swap sizing  

Okay, thanks.


Montus
New User

Feb 21, 2017, 8:57 AM

Post #6 of 7 (152 views)
  post locked   Re: 1968 Chevelle Malibu 4-door transmission swap sizing  

The pictures were a slight pain to get up, and I actually did some resizing, I guess it wasn't enough. Sorry about that.


(This post was edited by Montus on Feb 21, 2017, 7:05 PM)


Montus
New User

Feb 21, 2017, 9:14 AM

Post #7 of 7 (148 views)
  post locked   Re: 1968 Chevelle Malibu 4-door transmission swap sizing  

It turns out the transmission's Bell housing cracked on two sides, so there's no rescuing it. I will check out the dimensions but I intend to get a short tail so that it shouldn't have a problem distance wise. I completely ignored vertical spacing though, I'll make sure to check the spacing on the cross-member, and I'll consult the seller on what flywheel should fit. I don't believe it's a powerglide, and would a new th350 come with a vaccuum line?, if not what vaccuum line should I get?






  Email This Post
 
 


Feed Button




Search for (options) Privacy Sitemap

shopify
site analytics