Put overdrive in your Classic vehicle. Conversions of automatic or manual transmissions.  We specialize in TREMEC T5's, TKO and T56 Magnums.


"Five/Six Speed Conversion Specialists"


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T-5FAQ Index

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  • How do I know if my aftermarket shifter is adjusted correctly?

    Move the shift stop all the way back and shift into 3rd and adjust the stop until it just about touch's with no pressure. Repeat this step in 4th for the lower stop.


  • What are the two black wires on top of the T-5 for?

    The two black wires on top of a Ford T-5 is the neutral safety switch used for cruise control. You can remove this in a vintage car as it is not needed.


  • How much horsepower can a T-5 handle?

    That depends on what T-5 you are starting with. Torque rates vary from 240ft/lbs to as high a ~500ft/lbs with aftermarket race gears. The strongest factory T-5 is known as a T-5z at 330ft/lbs. It is not uncommon to use this trans behind 450hp. Contact us for specific information regarding your application.


  • Can I install a T-5z into a 94-95 Mustang?

    You can now as we offer special input shafts that are longer for the 94-95 mustang bellhousing. See our products page for more information or give us a call.


  • Can a NWC T-5 be upgraded to world class?

    Not really. Only the main case can be with the right gears and it is not worth the time or money. It is better to start off with a WC T-5 and upgrade it with better gearset and other options.


  • If the ID tag is missing, is there way to figure out what T-5 I have?

    Yes, there are several ways to narrow down the ID. First is to check the shifter location. Mustang shifters are almost at the end of the tailshaft housing. Camaro shifters are right about the tailshaft bushing. Second is the input shaft size and splines, third is the date code on the main case and or top cover. GM T-5 have a 26 spline input shaft where the Fords are 10 spline. The V8 Ford T-5 have a .670 pilot bearing, where as, the 4 cylinder pilot is .590. Fourth is the lower cluster bearing just under the front bearing retainer. Is it stamped steel or a molded bearing race? Stampped steel tells you it is a NWC where the molded race makes it a WC T-5 (the name Timken can be read).


  • Where do I find the ID number?

    The ID of all B/W and Tremec transmissions is found on a metal tag bolted to the main case. The number found on the main case or tailshaft housing will not ID the transmission.


  • Are all T-5 the same?

    No, not by a long shot. Be sure to read the T-5 history tech article and review the id chart.


  • Can 5th gear be geared down or up from stock overdrive?

    Yes, 5th gear can be changed from .68 to .73, .80, or 90. .63 can be changed to .59, .73, or .83


  • Can I use a 4 cylinder T-5 behind a V8?

    A 4 cylinder T-5 will bolt up to a V8 bellhousing with a "special" bushing. However, the 4 cylinder T-5 gearing is very low and is torque rated for only 240ft/lbs. It is recommended that the transmission be upgraded with V8 gearing before being but into service behind a V8. We can do this for you. See our T-5 history page for more details.


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Last edited: 2017-02-11 13:29