ConcoursMustang Forums

1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1969 Mustang => Topic started by: keeper on May 28, 2022, 12:16:26 AM

Title: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: keeper on May 28, 2022, 12:16:26 AM: I was told I needed a gear reducer for the speedometer cable by one expert and another said no, not for the 69 scj 3.91 4 speed car. Please help me get the correct info. as they are hard to find and certainly not cheap. Thank you in advance for any leads.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: rockhouse66 on May 28, 2022, 07:41:09 AM: What is the build date of the car? Makes a difference in the answer.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: DragPack69 on May 28, 2022, 07:49:21 AM: Check the information on the cj site.
Scott has the answer there
Jimis correct
Build date is the key

John
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: Vcode on May 28, 2022, 08:53:05 PM: Info from the CJ site.

https://www.428cobrajet.org/id-speedometer-adapter
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: keeper on May 29, 2022, 04:35:22 PM: It was built 3-20-1969. V-Code , thank you for the documentation. Looks like my build date exempts me from needing the reducer. Thank you all for the input.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: rockhouse66 on May 29, 2022, 09:17:09 PM: Quote from: keeper on May 29, 2022, 04:35:22 PM
It was built 3-20-1969. V-Code , thank you for the documentation. Looks like my build date exempts me from needing the reducer. Thank you all for the input.

I agree - no reducer. But your transmission speedo drive gear will need to be the correct one for this time frame (not the same as the drive gear used with the reducer).
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: keeper on May 30, 2022, 03:11:23 AM: Thank you and I will make sure it is correct. Knowing the restoration was done using mostly oem parts I believe it is correct.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: 69supercj on August 26, 2022, 01:04:04 PM: So from what I gather from the CJ site, all 69 V or W code C-6 equipped cars used the reducer?
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: sah62 on August 27, 2022, 08:34:16 AM: Quote from: 69supercj on August 26, 2022, 01:04:04 PM
So from what I gather from the CJ site, all 69 V or W code C-6 equipped cars used the reducer?

Yes, that's what our research seems to indicate.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: keeper on September 09, 2022, 04:21:05 PM: According to the link from V Code that is not the case that all V codes and W codes used the gear reducer.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: J_Speegle on September 09, 2022, 07:49:21 PM: Quote from: keeper on September 09, 2022, 04:21:05 PM
According to the link from V Code that is not the case that all V codes and W codes used the gear reducer.

Correct it depended on when the car was assembled for the speedo adapters
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: keeper on September 10, 2022, 02:43:15 AM: It does appear that all automatic trany's did use the gear reducer regardless of assembly date. Interesting.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: rockhouse66 on September 10, 2022, 08:26:15 AM: I have never had a C6 apart but isn't the speedo input gear made on the shaft and not removable? If so, then that gear ratio is fixed (unlike the 4-speed) and a reducer would be required with all 3.91 and 4.30 geared cars.
Title: Re: 69 SJ SCJ 4speed close ratio V code 3.91 gears
Post by: J_Speegle on September 10, 2022, 02:45:10 PM: Quote from: keeper on September 10, 2022, 02:43:15 AM
It does appear that all automatic trany's did use the gear reducer regardless of assembly date. Interesting.

Yes but that's a little off thread ;)