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Tranny by Northwoods2
Started on: 02-03-2015 07:13 PM
Replies: 5 (180 views)
Last post by: Northwoods2 on 02-04-2015 07:02 PM
Northwoods2
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Report this Post02-03-2015 07:13 PM Click Here to See the Profile for Northwoods2Click Here to Email Northwoods2Send a Private Message to Northwoods2Edit/Delete MessageReply w/QuoteDirect Link to This Post
I have an stock automatic tranny. It's a 85 GT 2.8L. In an automatic, what options are out there to drop the RPM's a bit. I seen the gas mileage notes, and was wondering about the options, and give and takes on this ? I had an iron duke 5 speed which could get up to 40 mpg, and my current 2.8 get's about 24-26 on the highway.
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Gall757
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Report this Post02-03-2015 08:05 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
That mileage is normal for the stock Fiero 3 speed TH125c transmission. It was designed to operate best at 55mph back in the 80's. You can put in a 4 speed auto, or switch the car to a manual transmission, but that's a lot of work to save a few mpgs.

edit...you could expect about 32mpg highway from a 5 speed on the V6.

[This message has been edited by Gall757 (edited 02-03-2015).]

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randye
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Report this Post02-03-2015 09:15 PM Click Here to See the Profile for randyeClick Here to visit randye's HomePageClick Here to Email randyeSend a Private Message to randyeEdit/Delete MessageReply w/QuoteDirect Link to This Post
Tranny:


The old stock ones all get bad mileage.

[This message has been edited by randye (edited 02-03-2015).]

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dobey
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Report this Post02-03-2015 09:16 PM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
More like 28 with the 2.8/Getrag 5 speed, unless you're at a higher elevation like 1000 ft above sea level.

If you want more MPG and/or lower cruise RPM with the auto in the Fiero, you basically need to swap transmissions to get an overdrive, as the 3 speed doesn't have OD at all. Top gear is 1:1.

Depending on how many gears you want, and how much you want to spend, you can go up to a 6 speed automatic that has the metric bell pattern which bolts directly to the stock 2.8 engine. If you want to convert to manual, you can also choose between 4, 5, or 6 speed options, depending on how much you want to spend.

The cheapest/easiest swap to get you an overdrive gear, is the 440t4/4t60 (non-E version).
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Stubby79
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Report this Post02-03-2015 11:53 PM Click Here to See the Profile for Stubby79Send a Private Message to Stubby79Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by randye:

Tranny:


The old stock ones all get bad mileage.



But probably have plenty of gas!
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Northwoods2
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Report this Post02-04-2015 07:02 PM Click Here to See the Profile for Northwoods2Click Here to Email Northwoods2Send a Private Message to Northwoods2Edit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks, interesting.
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