Input shaft conversion for C4 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 12-09-2003, 12:11 PM
k2mooch's Avatar
Member
 
Last photo:
Join Date: Sep 2003
Location: Fort Mill, SC
Age: 35
Posts: 174
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Input shaft conversion for C4

I read a few articles in the KB and tech and have a few questions about the 24 tooth to 26 tooth input shaft upgrade for a C4. I have a '69 case fill with a 6 cyl bellhousing with a 24 tooth input shaft. The other transmission I have is an '83 C5 with a 26 tooth and components. Will these interchange, or do I need another C4 with a 26 tooth input shaft?

I was under the impression that the C5 is like a modified C4 and some parts would interchange, just wanted to be sure before I went ahead.

Also, is there any way of knowing if my '83 351W truck motor has a 157 or 164 tooth flexplate? I need to be sure of what bellhousing to get for my case fill C4 to bolt it up using the 26 tooth input shaft and c5 torque converter. Thanks in advance.

MoocH

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-09-2003, 07:10 PM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Morris update 9-28-2014
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,104
Wiki Edits: 1659

Thanks: 344
Thanked 103 Times in 99 Posts
Re: Input shaft conversion for C4

the parts will interchange, but........

Watch for the early case needing an O-ring seal on the pump. I cannot remember what year Ford changed the front area of the case to where an O-ring is NOT used.

There is a little hole in the case at the pump gasket area that must be pluggged off if a NON O-ring pump is used. The hole is at the pan rail level and it connects to the pan area. No O-ring and the oil will seep by and leak.

Your truck should have the large flywheel





Quote:
Originally posted by k2mooch
I read a few articles in the KB and tech and have a few questions about the 24 tooth to 26 tooth input shaft upgrade for a C4. I have a '69 case fill with a 6 cyl bellhousing with a 24 tooth input shaft. The other transmission I have is an '83 C5 with a 26 tooth and components. Will these interchange, or do I need another C4 with a 26 tooth input shaft?

I was under the impression that the C5 is like a modified C4 and some parts would interchange, just wanted to be sure before I went ahead.

Also, is there any way of knowing if my '83 351W truck motor has a 157 or 164 tooth flexplate? I need to be sure of what bellhousing to get for my case fill C4 to bolt it up using the 26 tooth input shaft and c5 torque converter. Thanks in advance.

MoocH
__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-09-2003, 07:31 PM
airworld2's Avatar
Member
 
Last photo:
Join Date: Mar 2003
Location: houston texas
Posts: 583
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
c4

why would you want to change input shaft?are your parts bad and you need replacement parts? I know some people that restore old mustangs that wouldn't change the parts with me its what ever parts I need at the time that get changed.as far as concerning the hard parts on a rebuild
__________________
airworld2
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-15-2003, 07:34 AM
k2mooch's Avatar
Member
 
Last photo:
Join Date: Sep 2003
Location: Fort Mill, SC
Age: 35
Posts: 174
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I want to change out the 24 tooth spline just because I'd rather have something stronger in there. If I'm not mistaken, they rarely used a 24 tooth on the V8's. If I have something bigger and stronger to change it out with (26), why shouldn't I? If I can find a torque converter to fit a 24 tooth spline and durable enough to not break my input shaft (or the components inside that it's connected to) then tell me it's safe and I'll go shopping tomorrow and save myself the hassle

I'd rather just do this and not tamper with the C4, but I'm just worried that the 351 will put too much stress on the front parts. Any suggestions? Thanks fellas.

MoocH
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-15-2003, 08:28 PM
airworld2's Avatar
Member
 
Last photo:
Join Date: Mar 2003
Location: houston texas
Posts: 583
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
c4

never seen that shaft brake in all my years rebuilding. yes they did you the small shafts behind small v-8's till 1970
__________________
airworld2
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-16-2003, 08:44 AM
k2mooch's Avatar
Member
 
Last photo:
Join Date: Sep 2003
Location: Fort Mill, SC
Age: 35
Posts: 174
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sounds good to me. I was just under the impression that the 24 was meant for 6 cyl's and low-power smallblocks like the 260/289/maybe 302. I didn't want to put any extra strain on it from a 351.

If Ford used the 24's before and had little problems, I'm cool. I probably won't dog it bad enough to break anything. Just looking for durability. Thanks for the help guys. I ordered my new lockup converter yesterday and hope to have it all together by christmas.

MoocH
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-16-2003, 06:23 PM
adtkart@aol.com
 
Last photo:
Join Date: Oct 2002
Location: Newport News, VA
Posts: 3,220
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I also have never seen one of those shafts break. If you break it, you are going to be breaking other things too. It;s been a while, but I thought the only difference, was the number of splines on the shafts.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-17-2003, 06:40 AM
airworld2's Avatar
Member
 
Last photo:
Join Date: Mar 2003
Location: houston texas
Posts: 583
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
c4

most converter re builders have omitted or deleted lock up components on c5 (80's type) converters for years never held up was as my understanding a horse shoe lock up like go cart clutch.
__________________
airworld2
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-29-2003, 10:36 AM
k2mooch's Avatar
Member
 
Last photo:
Join Date: Sep 2003
Location: Fort Mill, SC
Age: 35
Posts: 174
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
www.accuratetrans.com

These guys will custom-build any converter to specs you provide and ship to Auto-Zone for purchase. Mine is a ford lockup with an 11.5 bolt pattern to fit a 164 tooth large flexplate that mates to a '69 C4 with a 24 spline input shaft. It's almost impossible to find one that large with a 24 spline since late-model C4's, C5's and C6's all used a 26 spline.

I highly recommend Accurate Transmissions to anyone trying to mix and match anything. They are extremely helpful. Thanks guys for all your help. I'm on my way now.


MoocH
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 07:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.