Finding the right toploader to replace my SROD
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New User
Joined: Dec 2004
Posts: 16
Likes: 0
From: San Diego
Finding the right toploader to replace my SROD
First off, thank you to all the members who gave me insight into how to address my transmission situation, I really appreaciate it.
I want to replace my manual 4-speed overdrive SROD transmission with a used toploader transmission.
My truck is a 2WD shortbed 1980 F100 with a 300cid 4.9L straight-six and a 9" limited-slip rear with 3.00 gears.
I want the switch to invole as little modifications as possible (driveline, etc...).
When I'm looking for a toploader, what spec's on the tranny should I be most concerned with, in order to not have to make any unnecessary modifications?
My SROD is 24" long and here are the numbers/letters that are stamped on it:
RF-D9BR-7006-AB
ACE/CO 2
C-2604194
The shifter turret mounted on the rear extension housing also had some codes:
RF-EOTR-7F306-AB
C-2604302
FA1
This turret also had a cable connected to the back of it. I don't know what it is, could it be an indicator that senses when I put the tranny in reverse? I don't think its the speedo, because there's another cable connected to the rear extension housing, right near where it connects with the main part of the tranny.
Anyway, when looking for a toploader, what is an acceptable engine size range and rear-end gear ratio range of the vehicle that the tranny came from, that would work for my application? I think I should look for a close ratio, how do I verify this? How can I be sure I won't have to make any mod's with the driveline, cable connections, clutch linkage, tranny mounts, and anything else I can't think of, for that matter?<!-- controls -->
I want to replace my manual 4-speed overdrive SROD transmission with a used toploader transmission.
My truck is a 2WD shortbed 1980 F100 with a 300cid 4.9L straight-six and a 9" limited-slip rear with 3.00 gears.
I want the switch to invole as little modifications as possible (driveline, etc...).
When I'm looking for a toploader, what spec's on the tranny should I be most concerned with, in order to not have to make any unnecessary modifications?
My SROD is 24" long and here are the numbers/letters that are stamped on it:
RF-D9BR-7006-AB
ACE/CO 2
C-2604194
The shifter turret mounted on the rear extension housing also had some codes:
RF-EOTR-7F306-AB
C-2604302
FA1
This turret also had a cable connected to the back of it. I don't know what it is, could it be an indicator that senses when I put the tranny in reverse? I don't think its the speedo, because there's another cable connected to the rear extension housing, right near where it connects with the main part of the tranny.
Anyway, when looking for a toploader, what is an acceptable engine size range and rear-end gear ratio range of the vehicle that the tranny came from, that would work for my application? I think I should look for a close ratio, how do I verify this? How can I be sure I won't have to make any mod's with the driveline, cable connections, clutch linkage, tranny mounts, and anything else I can't think of, for that matter?<!-- controls -->
Postmaster
Joined: Dec 2002
Posts: 3,959
Likes: 9
From: USA
I can't answer all your questions, but if you want to read all about Ford Toploader 4-speeds, check out this website: www.5speeds.com/toploader.html The name says 5-speeds, but they have very in-depth info on the 4-speeds as well.
