SPEEDOMETER DRIVEN GEAR AND BUSHING

alexandrewillys51 · Post by **alexandrewillys51** » Tue Oct 01, 2019 4:12 pm

Hello,

I am restoring an M38.
This jeep has only chassis and body!
I am rebuilding all parts to recover and be able to bring you back to the glory times !!!

I got several used and original pieces in perfect condition, but I have a problem that I can't solve.

The transmission I'm using is a T90 that came from a CJ3A model, and I already bought the original NOS speedometer cable.

But I don't know which SPEEDOMETER DRIVEN GEAR AND BUSHING to use, could anyone help me with this question?
I also don't know where to buy this piece because I already checked with PETER DEBELLA, MIDWEST MILITARY, ARMY JEEP PARTS, among other suppliers.

Thanks in advance for your attention and help!

Alexandre

Post by **wesk** » Tue Oct 01, 2019 11:11 pm

Hello Alexander,

Here's a sheet I made up several years ago:

MA/MB/M38/M38A1/M170 Speedo gearing

Gear, Drive:
4 t 1.775 OD SP# 18-452-2, WG# J2-169, WG# J2-169A, WO# A1511 ORD# 7373166
Gear, Driven:
15 t Short early: SP# 18-453-9, WO# 801696, ORD# 7697553 (MA/MB/M38)
15 t Long late: SP# 18-453-10, SW# 448361, WO# 806718, ORD# 8328480, FSN 2520-040-2483, NSN 2520-00-040-2483 (M38late/M38A1/M170)
Sleeve:
Short early: SP# 55-454-2, WO# 801092. ORD# 7697552 (MA/MB/M38)
Long late: SP# 55-454-3, SW# 418991, WO# 806719, ORD# 8328481, FSN 2520-040-2484, NSN 2520-00-040-2484 (M38late/M38A1/M170)
Speedo Cables were early/late as well but either will work on either.
ORD# 7527480, AC# 1581436, SW# 446125-55, WO# 801093, FSN 6680-752-7480
Shaft, flexible, assembly (includes casing and core) (superseded by shaft, G744-7389881)(Used on vehicles thru sn MC44029) 54.5” long
Uses Core: ORD# 7527483, WO# 118117, FSN 6680-752-7483
ORD# 7389881, AC# 1581436, SW# 446125-57-1-2, WO# 805129, FSN 6680-832-7566, NSN 6680-00-832-7566
Shaft, flexible, assembly (includes casing and core) (supersedes Shaft, G744-7527480)(Used on vehicles after sn MC44029) 56.75” long
Uses Core: ORD# 7355830, AC# 1581351, FSN 6680-832-7655, NSN 6680-00-832-7655

Here's what they look like:

alexandrewillys51 · Post by **alexandrewillys51** » Wed Oct 02, 2019 5:03 am

Wes,
With the information you have provided me, I can clearly understand the correct parts for each version of M38.

But when using a CJ3A Model T90 transfer, can I make parts compatible?
I mean, use original speedometer panel instrument, original NOS speedometer cable, so what gear should I buy (LONG OR SHORT)? Is it possible to make it work this way?

Thanks!!
Alexandre

Post by **wesk** » Wed Oct 02, 2019 10:07 am

You keep mentioning CJ3A. Which jeep are you working on? The CJ3A or the M38?

If you have the civilian Transfer the only difference between the CJ3A transfer and the M38 Transfer is the shift levers mounting shaft. The M38 transfer uses a special bolt with a built in grease fitting. As long as transfer came from behind the stock CJ3A T-90 trans then the ratio will be the same for the speedo gears. Drive gear 4 teeth and driven gear 15 teeth. If you do have an M38 and want accuracy in your restoration then use the correct length gear, sleeve & cable for your jeeps serial number. If not use either as a set. You cannot mix and match. Long gear has to mount with long sleeve and short gear has to mount with short sleeve.

I also don't know where to buy this piece

Note that my lists below include the federal stock numbers for the gear and sleeves. It helps to be able to google search your browser using these numbers. To alter the given federal stock numbers to use them as National Stock Numbers just add two 00- after the first four digits and dash. IE:

Driven Gear 15 t Long late: SP# 18-453-10, SW# 448361, WO# 806718, ORD# 8328480, FSN 2520-040-2483, NSN 2520-00-040-2483 (M38late/M38A1/M170)

In your future posts you will not have to remember to post your Jeep model first if you just add the Model and year of your jeep to your signature block in your profile.

alexandrewillys51 · Post by **alexandrewillys51** » Wed Oct 02, 2019 11:08 am

Wes,

I am working on an M38.
But when I bought the Jeep, there were only chassis, rear and front axle, and body.
All the other parts I am buying, so I installed a transfer of CJ3A, model T90, but I already changed the cover for a model of M38, because the lever is different!

So I have an M38, but the transfer case and engine set I got from a CJ3A to make it work.

I think I could explain it better?

About your explanation of the parts, I think I get it.
I'm going to buy a long or short set, both can work perfectly on my Jeep, but should I buy both long pieces, or both short pieces, so will I have a perfectly working set?

Thanks again for your attention.
Alexandre

Post by **wesk** » Wed Oct 02, 2019 2:30 pm

I'm going to buy a long or short set, both can work perfectly on my Jeep, but should I buy both long pieces, or both short pieces, so will I have a perfectly working set?

Long gear must be used with long sleeve and short gear must be used with short sleeve.

I installed a transfer of CJ3A, model T90

The transfer case is a Spicer model D-18. The Transmission is a Spicer Model T-90.

The transmission model T-90 is a 3 speed forward type with one speed reverse. The cover uses a single lever but the boot differs between the M38 and the CJ3A.

The transfer case model D-18 is a 2 speed transfer with two levers and the difference between the M38 and CJ3A versions is the pivot bolt for the M38 has a grease fitting.

Spicer D-18 Transfer case for m38

The M38 uses these items "F" & "G"

alexandrewillys51 · Post by **alexandrewillys51** » Fri Oct 04, 2019 4:38 am

Wes,

Thanks for your help!
Now I'm sure my set will work perfectly, and I've already found the part with the codes and research you provided me.

Soon we will have another M38 running !!!

Thanks!
Alexandre