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General Specifications and Cost

The Spec 25 transmission is based on our replacement line of Muncie "M22" style 4 speed transmissions. It comes only with a GM style 1.125" diameter by 26 spline input shaft. The output shaft is 32 spline. The main uses the standard General Motors bolt pattern found in all Muncie, Super T10, Saganaw, and GM T5 transmissions. The sealed front bearing retainer has an outside diameter of 4.680". This is the standard GM retainer dimension. All transmissions come with a filtered vent and rollerized 1st speed gear.

Lead time and Cost:
 Average lead time is 3 weeks and cost is $2675.00 Price is direct to you. The Spec-25 is not sold through dealers.

Synchro Assemblies:
The synchronizer hubs are polished and the strut keys are processed using the Mikronite system. Synchro blocking rings are forged bronze rings and fitted to each gear.

Gears:
All gears use the standard M22 style semi helical configuration. They are deburred and then processed using the Mikronite system. They are of 8620 alloy which is optimized for strength and wear.


Filtered vent shown.

 Shifter Shafts:
Linkage arms fasten to the shifter shafts with 3/8-16 NC grade 8 bolts. This method is much stronger than stud type shafts. In the event you require "stud type" shifter shafts we will gladly outfit your transmission with them.

Hardware:
All hardware is Grade 8. Fill and drain plugs are drilled for safety wire. Transmission comes with a new speedometer fitting as well.

Gear Ratios:
The Spec-25 is offered in 2 different ratio sets.
Model Type Ratios
S25 2.20 1.64 1.28 1.00
S25X 2.20 1.51 1.17 1.00