TECH: Ultimate T-5 Article

Yes the tail shafts interchange. Yes you need to modify the speedometer gear location (there are several articles online). "After Market" refers to it was not installed in production cars, they were manufactured for sale to be installed by the purchaser. SVO, Ford Motorsport, etc. sell "After Market" parts.

 

This is how I get mine, in a box!
Ford Racing M7003Z T5 Transmission! This Ford Racing M-7003-Z Mustang T-5 Transmission is a great replacement for a blown, grinding, or malfunctioning transmission. This 1979-1993 Mustang t5 transmission is perfect for your Fox Body Mustang build and offer several upgraded features over the factory transmission. Not only does this t5 transmission include higher performance internal parts it is also rated for more power than the factory transmission if your Mustang.

High Quality Construction
Ford Racing's heavy duty T-5 transmission has a 300ft/lbs torque capacity to take on the demand of high horsepower Fox Body Mustangs. With improved synchonizers, bearings, and a short throw shifter, this transmission shifts smoother and faster to give you better performance on and off the track. This World Class T-5 5 speed transmission features double mold 2nd speed and 3rd speed gears with carbon fiver 3-4 blocker rings.

Technical
This transmission has a 1.0625" diameter 10 spline input shaft, 28 spline output shaft, and a 7 tooth speedometer drive gear. The gear ratios are: 1st 2.95; 2nd 1.94; 3rd 1.34; 4th 1.00; 5th 0.63.

 

Thanks for the info Duece Lover. That helps a lot.

 

Tagged

 

Jim, You need a computer geek to help you print it out.Maybe you can copy and paste the link and attach it to an email address? Sheldon

 

So, its safe to say that the WC t5 output shaft is not interchangeable with the NWC t5? If you have a WC gearbox and install the s10 tailhousing, you cannot put the s10 output shaft into a WC gearbox? THe main reason would so you could relocate the speedo gear, and not have to build up the shaft with a shim.

 

I bought my WC T5 (its actually a 93 GMC S15 WC trans)from Allstate Transmission in San Antonio,TX from their EBAY auction.They offered to to the S10 tailshaft mech speedo conversion for me and charged me at the time $139.Their phone # 210-922-7901.Now that was in 2010.I hope they are still in business.They I am sure can give you an accurate answer.They explained what was needed to switch the tail shaft.

 

Did it have the short imput 26 spline shaft, with the chevy pattern, or ford pattern??

 

The S15 has the 26 spline Ford pattern.I don't remember what length the input shaft was.There are 3 adapters to get to mate with the SBC so might be the long one.If you look at my post #298 on pg 10 I posted a pic of the installation in my 36 Ford coupe with an explanation

 

Does a 5 speed out of a 1990 full size chevy truck use a cable speedo or electric speedo drive, I found a whole truck cheap with a V8 and thinking about getting it for a future build project

Thanks kb

 

I just looked it up on my Alldata system and it shows the 90 full size chevy trucks to have an electric speedo and they do not have a T5, The bell housing is part of the tranny and I believe it is a NV3500 tranny. But if you are using the engine and tranny together then thats not a concern. Hope that helps.

 

Thanks for looking it up, anything built after 1950.... I'm kind of lost with inter change and parts numbers

thanks ed

 

'90 was the first year for electric speedo; for the t-5 anyway...

 

I have two NWC T-5s, one is a pretty beat up with a 3:78 first gear and a mechanical speedo, the other is a 4:03 first gear with a electronic speedo. My question is can I swap the output shafts and tail case without regards of the gear ratios?

 

Yep, I think so, but I wouldn't want either set of gears. What are you putting it in?

 

The Roadster in the avatar..........You said you wouldn't like either gear set......what choices do you have with a NWC t-5? I know there is a 3:50 first gear but I don't have access to that and its probably pretty hard to find.

 

It all depends on what you are wanting and how you want to drive it. Those are very wide gear sets, something along the line of truck granny gears, with a low rear gear 1st gear is almost useless. With a high rear gear it is more drivable but overdrive is not very useful. If you are just wanting to be able to drive around it will work, but for high performance you really need close ratio gears. A 5.0 mustang would have a 2.95 first gear. That coupled with say a 4:11 rear end gives you a good acceleration combination (12:12 final drive). Coupled with a .63 OD gear final drive is 2:59. For a similar combo with a 3:78 first gear you would need around a 3:21 rear gear and with a .78 OD gear that would be a final drive of 2:50. Not as good, but not that bad. With a 4:03 for a combo similar to the mustang example would need a 3:00 rear end and with a .78 OD the final drive would be 2.35 which is a lot of load on an engine. You can play with the rear end ratios, but there just are not ideal combinations with a wide ratio transmission. These are just examples, but gives you the idea. This is why in the early days of Hot Rodding the Zephyr gears were so popular, to get to a close ratio transmission. Again, all of this depends on how and where you will be driving and the engine you are using. With the NWC transmissions I'm not sure if there are good gear options, I would have to check, I only work with the WC T5s and Ford T5s at that!

Edit: I was reprimanded in a later post for not pointing out that the 2.95 gear set is an aftermarket get set and that most 5.0 mustangs have a 3.35 stock gear set. I run T5z transmissions in all of my cars, including my 33 5-window flathead. The above was to provide a simplified example of gear ratios and not a detail specification of T5 gear set ratios, so some of the other ratios may be off as I did not verify the ratios used in each example.

 

These are the original Ford and Lincoln/Zephyr gear combinations, as you can see a lot of the T5 gears are not as good a comb as the original gears. The Ford T5 (and later Camaro) gears (the 2.95 transmissions) fall between the Ford/Zephyr 28 & 29 tooth gears. The lowest Ford Truck 3-speed gears were a 40-tooth low gear which was a 3:72 gear ratio. So a T5 with a 3.78 1st gear is lower than the lowest Truck gearing (3-speed).

Transmission Gears and Ratios

• 26H Lincoln 25-tooth Low Second High 2.12 1.44 1.00
• 06H-56H Lincoln 26-Tooth Low Second High 2.33 1.58 1.00
• Ford-Merc Lincoln 28-tooth Low Second High 2.82 1.60 1.00
• Ford-Merc Lincoln 29-Tooth Low Second High 3.11 1.77 1.00

Source Teeth Low Second High
26H Lincoln 25 2.12 1.44 1.00
06H-56H Lincoln 26 2.33 1.58 1.00
Ford-Merc Lincoln 28 2.82 1.60 1.00
Ford-Merc Lincoln 29 3.11 1.77 1.00

 

Jseery,

You posted lots of good stuff, but the only Mustang that came with the 2.95 set (also known as the T5z gears) was the Cobra. Typical 5.0s came with the 3.35, 1.99, 1.33, 1.00, 0.68 gear set, which is not only the most common, but also something that may work well for 37fatfender.

 

Well, yes and no. I run the T5z transmissions in all of my cars, they are stronger and I like the gears. The following T5 transmissions have 2.95 1st gears.
B/W ID: 115, 200 202, 225, 227, 249, 251 and these are all considered aftermarket transmissions. And a lot of the Cobras had 3:35 gears: the 93, 94 & 95s did.

Sorry if I confused anyone about stock mustang 5.0 T5s all having 2:95 1st gears, need to modify that to say My 5.0 mustangs have 2.95 1st gears LOL.

Guess that reinforces my point though, a stock 5.0 mustang (most but not all) have 3.35 1st gears. But when you want to step up the performance you switch to the close ratio 2.95 gear set. Same now as in the 50s with the original Ford boxes, close ratio gears are better for performance. If that is not a concern and you just want to drive the thing then I don't think it is that big a deal, just be aware of the difference and use that as a guide for selecting a rear end gear.

I agree with Mike, the stock 3.55 gear set would not be a bad one to use if you want a cheaper alternative, it is the 3.78 and 4.03 that start being an issue.

Thanks Mike for the input and I added a note to the earlier post.

 

Not true. The '83 & '84 Mustangs were equipped with a NWC T5 with 2.95:1 1st gear. I have one that was wiped out. I'm thinking I can repair it with the GM 2.95 gears from a V-8 NWC transmission. Sure, the input shaft will change, but that doesn't matter since my application was not originally equipped with a T5
The '90-'93 Mustang transmissions are strongest regular production units. The highly desirable Cobra T5's are the strongest and also have the 2.95 1st gear, as you have noted.

 

I will be the first to admit I know very little about NWC T5s and really don't want to learn much about them! LOL I am a WC T5 guy and mostly T5z.

 

Don't blame you for that, but for most flatheads, 6 cylinders, and bangers, they are plenty strong, available cheaply, and almost always have a mechanical speedometer drive.

 

Good points, I just always go with the T5z, they were cheap to buy new from Ford until recently. I could buy them from the local dealer for around $1,100 and there was no shipping charges that way. Just couldn't resist using a new transmission. I have rebuilt a few, but the price of the transmission and the new gears, etc. make the new ones appealing. Well, that was before, now the price has jumped way up.

 

Just to get back on topic, I'm no expert but I believe the answer to your question is yes, but that leaves the question whether you'd actually want to use what you have.

 

It's what I got and what I can afford, the roadster has a flathead and T5 now with a 3:80 rear. The problems is the NWC mech speedo 3:78 gear is junk, that's what's in the car now. I need the mech speedo, hence my question to NWC experts can I swap the tail shaft from a 4:03 first gear trans into the 3:78 tail shaft to go into the 4:03 case? What needs to be done to swap tail shafts with 2 different first gear ratios?

 

All basic mechanical parts are the same and can be swapped. However, with the exception of the two gears that make fifth in the tail housing, all the other gears must be swapped as a set. The shafts are all the same in NWC.

 

Are all the T5 output shafts the same diameter?. I've read the swapping the speedo gear but nothing about the thickness of the shim needed. Mines in the car right now so it's kinda hard to measure, it's a '92 2.3 Mustang T5.

 

GM units are 27-spline.

Ford units are 28-spline.

They are not the same diameter.

 

It's electronic, and NOT a T5.