Really didnt have much clue that only certain year Si tranies were swappable

So my tranny is my car is grinding and making **** noises so I bought a new one that is apparently an 88 but Im hoping you guys can tell by the tranny stamps that I picked up that are beside the block stamp

The one in my car - L3 -1653022
The one I bought - L3 1386243

Just some codes I grabbed off of my engine are PM3 - 3 and 5733267

Hope you guys can give me some info before I swap trannies and have to put it all back together because it dont fit

Thanks

 

 

they are interchangable but you have to use the clutch and flywheel from that tranny. 1988 si are different than 1989-91. At least that is what i got fromt he obx lsd post. I could be wrong. Do a search for obx lsd that might help also. They talk about he different si trannys. You just need to look at the shaft for the spline count.

Josh

 

Bah look at the end of the input shaft. No rings around the shaft is a 88, 1 ring is a 89, and 2 is a 91.

88 models have different spline counts on the input shaft and have to use a different clutch disc on them. 89-91 trannies are compatible with the 89 clutch or 90+ clutch.

 

I cant count the splines when the tranny is still in the car....

Ive only got the 1 tranny sitting infront of me

Nothing can be said with the numbers off of teh tranny?

 

You dont know what year tranny you have in your car now?

 

No idea, I bought the motor/tranny together

Sohc zc motor and a tranny with that stamp number on it lol

I really wanted an answer before I went to work tomorrow morning so I dont remove a tranny for nothing because it isnt going to be very easy for me

 

 

no way to tell by the numbers?

 

Three ways to identify an 88-91 tranny:

1. Spline count on the input shaft will determine if it is '88, or '89-'91.

2. Carrier bearing diameter on the differential. 40mm ID bearings = Si. 30mm bearings = Dx or HF.

3. Pull the fill plug. Mark one tooth on the ring gear. Rotate the tranny and count the teeth. 68 teeth on the ring gear = Si.

The numbers on the tranny are pretty much useless.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jim Truett &raquo;</TD></TR><TR><TD CLASS="quote">Three ways to identify an 88-91 tranny:

1. Spline count on the input shaft will determine if it is '88, or '89-'91.

2. Carrier bearing diameter on the differential. 40mm ID bearings = Si. 30mm bearings = Dx or HF.

3. Pull the fill plug. Mark one tooth on the ring gear. Rotate the tranny and count the teeth. 68 teeth on the ring gear = Si.

The numbers on the tranny are pretty much useless.</TD></TR></TABLE>
actually, i think you will find that the HF also has 68 teeth on the ring gear

 

........ so what can I do??

 

really I was always positive you could tell by the numbers

Anyways, what about the number I gave for the engine, they must tell you then engine year right?

Then that would tell me if I have a 88 or 89-91 tranny

Then Ill just try and get ahold of the seller again and find out what year this tranny is

Need some help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">
actually, i think you will find that the HF also has 68 teeth on the ring gear</TD></TR></TABLE>

No, it doesn't. It is considerably smaller. I have one torn apart in my garage. I will count it tonight.

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">
actually, i think you will find that the HF also has 68 teeth on the ring gear</TD></TR></TABLE>

In CA we have 3.25:1, or 65 tooth ring, with a 20 tooth countershaft. All of my research leads to a 2.95:1 ratio for 49 state.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 Cam Wonder &raquo;</TD></TR><TR><TD CLASS="quote">really I was always positive you could tell by the numbers

Anyways, what about the number I gave for the engine, they must tell you then engine year right?

</TD></TR></TABLE>

All of the numbers you have given are serial numbers, and are nearly impossible to cross.

You do have a date code on the head, in a round stamp, near where you found the PM3. It is just above the exhaust ports.

 

But that wont tell me what year the tranny I just bought is

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 Cam Wonder &raquo;</TD></TR><TR><TD CLASS="quote">But that wont tell me what year the tranny I just bought is</TD></TR></TABLE>

I already told you how to tell what year the tranny is. Count the damn splines on the input shaft already.

 

OHHHH!!!!!!!

K Ill check after work

 

Yes there are a couple of variables of the 68 tooth ring gear&gt;&gt;68x16 and 68x17. Count the splines dude

 

The splines on the input shaft. It will either be 20 or 21. Let me know, and I will tell you what you have.

 

20!!!!

TWENTY!!!!!

VIGNT!!! (20 in french?) lol

Ya the tranny I bought is 20. Im gonna see what I can do about identifying the year of my engine

Thanks so far bud

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 Cam Wonder &raquo;</TD></TR><TR><TD CLASS="quote">20!!!!

TWENTY!!!!!

VIGNT!!! (20 in french?) lol

Ya the tranny I bought is 20. Im gonna see what I can do about identifying the year of my engine

Thanks so far bud</TD></TR></TABLE>

21 Splines = '88

20 splines = '89+

If the original head is on the engine, it will have a date stamp on the front, just below the valve cover.

 

****** sick, I was so hoping for it to be 89+

I havent ever gotten a chance to lift my hood, working from 6:45am-12:45am is killing me