Topic: spring color for C6 "H" servo

[67gt390fb]

Trying to get a C6 transmission set up for my mustang.
I have 3 springs I could use in an H code servo I picked up (it was missing the spring).   I have a yellow one, a plain one and a blue one.
Could one of these be correct spring to match the "H" intermediate servo?

If not, what should i be looking for?

[Keith Stem]

If I am reading the MPAC correctly Section A70.5 page 4 and 6, two springs (P/N 70D28) are possible.

The first spring (#28) is for a 1967 390 GT after 1/4/67 and it is 2.66 inches with 9.5 coils. This spring is also used for a 1968 390 GT and the 428. No color was listed.

The second coil (#29) is for a 1967 390 GT before 1/4/67, and 2.39 inches with 8 coils and is yellow.

[67gta289]

That's what I see as well in the 1968 MPC.  Pictures included so that you can see all of the information.

[67gta289]

Regarding the "H" code, from the previous pictures from the MPC, it looks like the "PGB-H, H1" was used on the full size Ford (A), Fairlane (B), and Thunderbird (S) depending on the year.  I don't see any Mustang application.  Note that this is in regards to the "transmission model" and may not equate to the servo identification.  Just pointing it out.

[Bob Gaines]

Regarding the "H" code, from the previous pictures from the MPC, it looks like the "PGB-H, H1" was used on the full size Ford (A), Fairlane (B), and Thunderbird (S) depending on the year.  I don't see any Mustang application.  Note that this is in regards to the "transmission model" and may not equate to the servo identification.  Just pointing it out.

H servo was used on 67 and early 68 GT 500 Shelby application.

[Keith Stem]

If the transmission is a PGB-H the (#29) spring is the correct spring at 2.39 inches with 8 coils and is yellow.

[67gta289]

H servo was used on 67 and early 68 GT 500 Shelby application.

Thanks Bob

[67gt390fb]

according to my build date of 12-15-66 , the PGA-P would be the O.E. trans  ,  using the # 29 yellow spring.

thanks,  this is great to find this info!  I spent a LOT of time searching.    I will measure the springs pictured and post results tomorrow. am curious to see if the yellow and plain one match the info for 28 and 29.

[67gt390fb]

the color codes do not match up, but the center one pictured in first post is close to specs for #29
measurements came out as:

first :       1.89"  and 6-3/4 coils       not close to any listed here
second:   2.29" and 8-3/8 coils        close to #29 specs(will use this one)
third:       2.53" and 8-7/8 coils        close to # 28 specs