Transmission Identification Help

Hi folks, been trying to identify a transmission that I have been offered. Is currently behind a v8 in a 1970 Chevy truck. I'd like to install in in my cj5 frame with a Dana 20 behind it.
I've seat he'd through Novak and advance adapters site and searched every part number I can see. But having trouble ascertaining exactly what it is....
I'm thinking t18 two or t98? Has anybody come across this transmission before? Thank you in advance.
Part number on the case is 2601253
Top cover is 2604703

 

It's either a T98 or a T18.

 

Sorry, your pictures are blocked to me. Suggest you drag and drop them into the forum. You can do that if they are reasonable size, like 800x600 or less.

 

received_2726750584206516
received_4017445588284037
received_1228878454148683

 

Not sure if they work?

 

It looks like the T98 in my ‘64 ford.
The question is, why is it in a ‘70 Chevy?

 

Yes, I would expect a SM465 in a '70 Chevy truck. Could be a T-18.Unlikely it's a T-98 with a backup light switch like that.



If so, it'll have numbers on the side of the case like this. Numbers on the shift top don't tell you much.

 

No numbers like those on the side unfortunately just these received_2098479406942375

received_402653004080580

 

Haha I don't know. I assume it has been swapped in at some point.

 

Is it a Chevy engine? That’s a really odd transmission. I’ve seen that casting mark before, but I can’t remember where.

 

I have a T98 and T18 that look like that.

T98


T18 (not a good picture)

 

Yes Chevy V8. The bell housing has the mounts and there is no transmission crossmember from what I can see?

 

Look at the front mounting flange.
And the lack of identification numbers on the side.
And the reverse light port.
Was a T-98 ever even an option from Chevy in the states?

The DS bulge and the tabs on the right side of the shifter lid screams T98, but there are just some weird anomalies. Did anyone buy the rights to the T-98 for foreign markets after it was phased out here?

 

T18 with the same backup light switch location. Still doesn't answer the casting number question. Maybe @oldtime knows more about this.

 

The picture above (T-18) has the same bolt pattern on the top plate as the one from the OP so I would say it's a T-18.

 

The Borg Warner T18 and T98 in particular was used by many manufactures for various industrial applications.
Some industrial versions will even be found having reversed helical teeth.
I am not familiar with the embossed casting numbers seen on the case nor the shift tower assembly.
It most certainly is not IH nor is it Jeep.
And I don’t recognize those as being Ford numbers either.
That said I note that the backup switch alone looks near identical to many of the Ford switches.
And it also has PTO port on right side like a Ford.
It is most certainly a T98 or a T18 and casting vestiges appear to be approx 1970 vintage.
I suggest you narrow T98/18 certainty down via internal inspection.
Pull off shift tower assembly and note the input gear tooth count.
Also note the number of teeth at rear (1st/ rev) on the countershaft gear.

 

Thanks again. The knowledge on this forum Is astounding! The transmission is currently adapted to a Chevy V8, and I plan to use either the V8 or a Chevy V6 so I'm good at the input end.
I want to use my existing Dana 20 if I can.
I've been doing a bit of reading and from what I can work out I'm going to need the factory adapter and mainshaft from a jeep truck? Not going to be easy to find.... does anyone remake such parts?

 

Adapting the Borg Warner T18 & T19 Transmissions to the Dana Spicer Models 18 & 20 Transfer Cases

 

Thanks Twin2. Same adapters output shaft for t98?

 

Yes, basically you will need a “Jeep” rear adapter plate and a “Jeep “ or an “IH” mainshaft.

Jeep used two different rear adapter plates.
The early “Texas” pattern adapter plate has 3-5/32” index bore as it was used with small bore transfer cases.
It is embossed with “T-98” and they were used through 1971.
The adapter plates after 1971 are all large 4” index bore.
Some were still embossed with “T98” designation yet most with “T18” designation.
The T18 plates (4” index) marked “T98 “ were used as early as 1969 and we’re phased out within a few years.

The T98 main shaft will not interchange with a T18 mainshaft.

Unless you can otherwise identify via transmission casting numbers; You need determine your transmission via 1st/Rev gear tooth counts.
The 6.32/ wide ratio T18 countershaft gear has a tooth count of 16 and the mating 1st/Rev slide gear has a tooth count of 40 teeth. The reverse idler gear for a T18 has 17/20 teeth.