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   witch trans should i use for 3800sc , iv got two?

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witch trans should i use for 3800sc , iv got two? by Scott2scott
Started on: 02-07-2015 03:20 PM
Replies: 18 (281 views)
Last post by: Tuna Helper on 02-08-2015 03:13 PM
Scott2scott
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Report this Post02-07-2015 03:20 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have two 4 speeds, one out of my 1984 witch is a m19 with 51,000 miles on it. and the other one is out of my 1986 v6 witch is a m17 with about 110,000 miles on it. its going in my 3800sc swap. i am wanting to stay with what i have so no 5 speeds upgrades. just what 4 speed i already have is the better .
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Report this Post02-07-2015 03:36 PM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
the 84 has a higher final drive ratio, but very low 1st gear, almost unusable for a 3800sc.

The M17 is a final drive ratio of 3.65 so it isn't as good for freeway work, but is much better for get up and go.

I have the M17 with my 4.9. It has a much stronger case and is believed to be the strongest tranny in the Fiero stable.

You'll be at around 3000 rpm at 60 mph, but it is a safer bet for spirited driving.

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Scott2scott
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Report this Post02-07-2015 04:27 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
thank you sir for your input. yea iv been thinking of using the 86 one anyways, just good to hear input from people that are using both. you know.
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Lou and Blue
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Report this Post02-07-2015 05:28 PM Click Here to See the Profile for Lou and BlueClick Here to Email Lou and BlueSend a Private Message to Lou and BlueEdit/Delete MessageReply w/QuoteDirect Link to This Post
I too am doing a 3800sc swap and I too have two 4 speed transmissions. I have already bought the clutch and I am definitely staying with the four speed. One four speed is presently in my 1985 GT which runs fine and one was given to me condition unknown. How can I tell what "M" numbers they are? All info is appreciated. Thanks, Im Already leaning towards keeping the one that's already running because I know it runs and because I don't have to take it off the cradle to do the swap.
Louis

------------------
===Always trying to find time to work on cars===
Louis Duet
Baldwin, Long Island, NY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Blue" <= '85 Fiero GT
Stock V6---Stock everything. Trying to keep it 'mostly' that way. But I just got the 3800sc to swap into it!
~~~~~~~~~~~~~~~~~~~~~
"Boo" <= '81 Delorean DMC-12
VIN #5835
Stock PRV engine
Peugot 604 Intake manifold
Exhaust headers
Anti-3rd brake light

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Scott2scott
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Report this Post02-07-2015 05:34 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
Open up the front hood on the drivers side Near the brake booster on the side is a little white card its a build sheet for car . Six rows over and like two or three down u will see M something 8 17 19
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Tuna Helper
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Report this Post02-07-2015 07:11 PM Click Here to See the Profile for Tuna HelperClick Here to Email Tuna HelperSend a Private Message to Tuna HelperEdit/Delete MessageReply w/QuoteDirect Link to This Post
There is no ID on the transmission?
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Scott2scott
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Report this Post02-07-2015 07:42 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
Its very ez to just open the hood and look at sheet . I dont think theres anything on the trans to tell you. The build sheet tells u everyhting about the car with code numbers and letters. Outside color inside color Trans and gearing. Its called , service parts identification card
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Gall757
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Report this Post02-07-2015 07:45 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The code sticker works.............but not if the transmission is not original

Manual Transmission Identification
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Scott2scott
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Report this Post02-07-2015 08:02 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
That link was cool to id what transmission u have as far differnt 4 speeds and 5 speed . But i didnt see anything to tell u what gear u have and that was his question about his 4 speed how to know what gearing he has . So i think the build sheet would be the best
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Tuna Helper
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Report this Post02-07-2015 08:09 PM Click Here to See the Profile for Tuna HelperClick Here to Email Tuna HelperSend a Private Message to Tuna HelperEdit/Delete MessageReply w/QuoteDirect Link to This Post
You are telling me that is unless its in the original car, there is no way to tell what gearing it has?

My car was originally a five speed, now its a four speed. I don't think the sticker will help.

[This message has been edited by Tuna Helper (edited 02-07-2015).]

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Gall757
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Report this Post02-07-2015 08:25 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
If it has the ribs in the case, it is a M17. If it is a smooth case, it could be a M19 sport trans or a MY8 econo trans. (which was only about 8% of production manual transmissions in 1984). The only way to be sure is to count shaft rotations. If it is in an operating car, just look at the mileage.

MY8 3.53 1.95 1.24 0.73 - 3.32final
M19 3.53 1.95 1.24 0.81 - 4.10final
M17 3.31 1.95 1.24 0.81 - 3.65final

[This message has been edited by Gall757 (edited 02-07-2015).]

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Report this Post02-07-2015 08:45 PM Click Here to See the Profile for FIEROFLYERSend a Private Message to FIEROFLYEREdit/Delete MessageReply w/QuoteDirect Link to This Post
Use the 86 with the 365 gears it is also a stronger case as the ribs show then the 84 tranny

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Over 30 years wiring experience between cars and trade as an avionics technician in both Canadian Air Force and civilian aviation.
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Scott2scott
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Report this Post02-07-2015 08:53 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
no clearly the sticker wont help you. that's obviouse if the trans has been changed from 5 to 4 speed. course the sticker wont work. I agree with everything gall757 posted .
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Lou and Blue
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Report this Post02-07-2015 08:54 PM Click Here to See the Profile for Lou and BlueClick Here to Email Lou and BlueSend a Private Message to Lou and BlueEdit/Delete MessageReply w/QuoteDirect Link to This Post
Any possible pics for reference as car as the ribbed case goes?

------------------
===Always trying to find time to work on cars===
Louis Duet
Baldwin, Long Island, NY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Blue" <= '85 Fiero GT
Stock V6---Stock everything. Trying to keep it 'mostly' that way. But I just got the 3800sc to swap into it!
~~~~~~~~~~~~~~~~~~~~~
"Boo" <= '81 Delorean DMC-12
VIN #5835
Stock PRV engine
Peugot 604 Intake manifold
Exhaust headers
Anti-3rd brake light

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Gall757
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Report this Post02-07-2015 08:58 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
did you open the link? Or am I missing your question?
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Scott2scott
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Report this Post02-07-2015 09:02 PM Click Here to See the Profile for Scott2scottClick Here to Email Scott2scottSend a Private Message to Scott2scottEdit/Delete MessageReply w/QuoteDirect Link to This Post
and thank you dan. I guess ill be switching transmissions in the next coulpe of days and putting my poly cradle bushing in also. everything is getting closer and closer to finish. next thing is fuel lines connections and coolant hoses. still have to figure those two items out. lol
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Lou and Blue
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Report this Post02-07-2015 10:28 PM Click Here to See the Profile for Lou and BlueClick Here to Email Lou and BlueSend a Private Message to Lou and BlueEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Gall757:

did you open the link? Or am I missing your question?

Sorry , missed the link.

------------------
===Always trying to find time to work on cars===
Louis Duet
Baldwin, Long Island, NY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Blue" <= '85 Fiero GT
Stock V6---Stock everything. Trying to keep it 'mostly' that way. But I just got the 3800sc to swap into it!
~~~~~~~~~~~~~~~~~~~~~
"Boo" <= '81 Delorean DMC-12
VIN #5835
Stock PRV engine
Peugot 604 Intake manifold
Exhaust headers
Anti-3rd brake light

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Gall757
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Report this Post02-08-2015 09:44 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
So.....Tuna Helper, What transmission do you have?
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Tuna Helper
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Report this Post02-08-2015 03:13 PM Click Here to See the Profile for Tuna HelperClick Here to Email Tuna HelperSend a Private Message to Tuna HelperEdit/Delete MessageReply w/QuoteDirect Link to This Post
It's a ribbed case, so I'm guessing it's the M17. It's out of the car right now, so I'll have to figure out where first is and count shaft rotations to make sure.
Thanks for the help.
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