Recently, I found a 1986 S10 T5 with cable speedo and the 0.72 OD gear and it had only 55K miles on it. Best condition T5 I've ever found. Drove 1.5 hrs each way to get it but my customer was very happy. I inspected and cleaned the inside and did the Jeep shaft swap with a new bearing and new tail seal. They are pretty hard to find in my area but I find 2 or 3 a year that are affordable.
Here are tips for using CL. I have found a few cable speedo S10 T5s using the word BORG as a search word.
Here are some tips that I use when searching CL.
Use the following terms as individual searches on CL.
Each will get a different set of hits.
T5
T-5
Borg
5 speed
5-speed
S10
S-10
Sonoma
S15
S-15
Camaro
Camero (some people spell it wrong)
Camro (some people spell it wrong)
Firebird
Transmission
While searching in a salvage yard, take a look at ALL the S10, S15 and Sonoma trucks 1989 and earlier. Even if they have a 4 speed, it might have a T5 tail stock. I know that sounds crazy. Why would a T4 4 speed have a T5 tail stock you ask? The only thing I can think of that makes sense is that Borg Warner was planning to phase out the cable speedo T5 S10 trannys and started using the same tail stocks on T4s just to get them off the shelf. I bought one from a guy and the guts are T4 but the case is all T5.
I always look at every S10 with a shifter, no matter what year, just in case someone swapped out the original tranny.
I also use a search engine - SearchTempest.com
It will search ALL the CL listings in multiple cities at once. You can specify how many miles from your zip code you want to search.
Just trying to help.
