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| WCF 5 and 6 speed transaxles |
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| WCF 5 and 6 speed transaxles |
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These transaxles can be used in any of the GM front wheel drive applications for high performance engines. |
| WCF heavy duty racing transaxle for the 1984 - 1988 Fiero. | |
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| Left Transaxle view | Bell housing view |
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To all of you that are interested in the 5-speed and 6-speed Trans, WCF has
finished the project. Through tireless research and engineering, the
transaxle that we have selected performs beyond our expectations. This
transaxle has better gear ratios, a
proven LSD (Limited Slip Differential) and is also capable of shifting
smoothly above 7000 RPM and has a higher horsepower rating than any Fiero
transaxle. |
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| Right transaxle view | Isuzu transaxle compared to WCF transaxle |
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| Transaxle adapter installed and trans mount | Transaxle adapter and left trans mount |
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A few cooling fins also had to be cut off the bottom of the trans to clear
the Fiero sub frame. We also had to notch the mounting bolt flange at the
top of the bell housing on the new transaxle to clear the GM mounting
bolts on the new adapter; as the bolt pattern are close to the same. The
transaxle adapter was designed to mount the transaxle to the GM bell
housing and trans mount. |
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| Left trans mount, clutch and shift linkage | Right drive axles installed |
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| Top installed view | Rear installed view with left trans mount |
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| Relief cut in body for transaxle | Starter motor relief cut |
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This transaxle is 5” longer and some slight frame work on the Fiero will
have to be cut to clear the trans. The modifications we had to do to the WCF Transaxle is to cut the bell housing to clear the starter nose and weld a cover for the starter nose. |
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| Right side transaxle mount | Clutch linkage and clutch cylinder installed |
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| Clutch linkage and trans mount | Left transaxle and subframe mount |
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This transaxle comes with a pull type clutch mechanism to release the clutch; this was changed to a push type clutch mechanism to accommodate the new clutch. |
| New clutch arm installed | |
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| Clutch arm | Fiero slave and push rod |
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| Half shaft installed | Left custom axle installed |
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With this transaxle and engine combination, the engine sits about 1”
higher than stock. The engine cradle can be cut to lower the engine and
trans. We kept it 1” higher as to keep the axles leveled (straight) under
power. One of reasons the axles can fail is when the axles are at an angle
to the CV and Tri pod; this increases the load on the axles tremendously and
this ultimately can cause axle failure. We kept the stock half-shaft and
bearing using a modified engine bracket to support the bearing and
half-shaft. New WCF axles were manufactured out of 4340 steel to fit the new larger
transaxle inner tripod and the fiero CV. The inner CV bearing is replaced
with a larger bearing from a 4T80-E transaxle axle to accommodate larger diameter axles. |
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| Transaxle half shaft | New WCF left and right axles with half shaft |
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| Front engine bracket and half shaft support | Half shaft support |
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| Front engine bracket | Front engine mount |
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Engine mounts are in the stock fiero engine mounting position, as well as
the rear trans mount location on the right side of the transaxle to the
sub frame. The front trans mount on the left side of the transaxle and
cross member is replaced with a new mount incorporated with the new trans
adapter. This mounting arrangement will not need a dog bone to restrain the
engine and transaxle. |
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| Right transaxle mount | Right transaxle bracket |
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| 3800 Flywheel | Cindered iron clutch disk |
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| Custom WCF 9-11/16" pressure plate | Custom WCF 9-11/16" pressure plate |
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The flywheel is a stock 3800 without any modifications. The clutch is the
same clutch (9 11/16”) hat used on the new Shelby Cobra with the Olds Aurora
engine. We need the extra overall height of the clutch to match the height
of the throw out bearing in the transaxle. This transaxle can also
accommodate a dual disk clutch for higher horsepower conversions with a
lower pressure plate and machined flywheel. This clutch set up also uses the stock 13/16 Fiero clutch slave cylinder. The throw out bearing fork and pivot are modified from another transaxle to fit this trans. The throw out bearing sleeve on the trans had to be lengthened to accommodate the new type clutch throw out bearing. The shift linkage on this transaxle does work with the Fiero shifter and has approximately 2/3 the throw of the stock Fiero shifter. |
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| Clutch installed | Flywheel installed |
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| Shift cable bracket | |
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Gear ratios |
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5 speed gear ratios (stock Fiero): 1st = 3.5 2nd = 2.05 3rd = 1.38 4th = 0.94 5th = 0.72 Final drive = 3.65 |
5 speed gear ratios: 1st = 3.071 2nd = 1.952 3rd = 1.4 4th = 1.033 5th = 0.771 Final drive = 4.063 |
6 speed gear ratios: 1st = 3.066 2nd = 1.956 3rd = 1.428 4th = 1.125 5th = 0.914 6th = 0.717 Final drive = 4.063 |
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