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356 928 |
California
Motorsports Inc. 2175
N. Kiowa Blvd Ste 108, Lake Havasu City AZ USA 86403 (928)
855-5755 voice, (928) 855-6021 fax |
Boxster |
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PORSCHE 993
TRANSMISSION G50 6 SPEED (prices and availability are subject to change
without notice) |
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TRANSMISSION SPECIFICATION ·
Trans type: G50/20, G50/21 ·
Origin: Porsche 911/993 Carrera 2 1995-1998 ·
Description: H Pattern 6 speed manual transaxle with
Borg Warner synchromesh w/synchronized reverse ·
Limited Slip
Differential: 25/65% ZF LSD optional
equipment ·
Drive flange size/CV
overall diameter: 110mm ·
Weight: approx 145lbs ·
Oil Capacity: approx 3.6L API classification GL5 75/90 ·
Speedometer: None ·
Trans controls: Shift linkage ·
Remarks: First and second use triple cone synchros ·
1st gear 3.82 ·
2nd gear 2.05
(2.15 G50/21) ·
3rd gear 1.41
(1.56 G50/21) ·
4th gear 1.12
(1.24 G50/21) ·
5th gear 0.93
(1.02 G50/21) ·
6th gear 0.78
(0.82 G50/21) ·
Final drive 3.44, 7.5” Gear chart, early G50/20 stock gears Gear chart, early G50/21 stock gears Gear chart, late G50/20 stock gears Gear chart, late G50/21 stock gears Gear chart, G50/31 stock gears |
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TRANSMISSION SPECIFICATION ·
Trans type: G64/20 ·
Origin: Porsche 993 Carrera 4 AWD 1996-1998 ·
Description: H Pattern 6 speed manual transaxle with
Borg Warner synchromesh w/synchronized reverse ·
Limited Slip
Differential: 22/40% ZF LSD standard
equipment ·
Drive flange size/CV
overall diameter: 110mm ·
Weight: approx 180lbs ·
Oil Capacity: approx 3.8L API classification GL5 75/90 ·
Speedometer: None ·
Trans controls: Shift linkage ·
Remarks: First and second use triple cone
synchros. Output to front diff via
viscous coupler. Can be converted to
2WD. ·
1st gear 3.82 ·
2nd gear 2.05
(2.15 G64/21) ·
3rd gear 1.41
(1.56 G64/21) ·
4th gear 1.12
(1.24 G64/21) ·
5th gear 0.93
(1.02 G64/21) ·
6th gear 0.78 (0.82
G64/21) ·
Final drive 3.44, 7.5” |
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TRANSMISSION SPECIFICATION ·
Trans type: G64/51 ·
Origin: Porsche 993 Turbo AWD 1996-1998 ·
Description: H Pattern 6 speed manual transaxle with
Borg Warner synchromesh w/synchronized reverse ·
Limited Slip
Differential: 22/40% ZF LSD standard
equipment ·
Drive flange size/CV
overall diameter: 110mm ·
Weight: approx 180lbs ·
Oil Capacity: approx 3.8L API classification GL5 75/90 ·
Speedometer: None ·
Trans controls: Shift linkage ·
Remarks: First and second use triple cone synchros. ·
1st gear 3.82 ·
2nd gear 2.15 ·
3rd gear 1.56 ·
4th gear 1.21 ·
5th gear 0.97 ·
6th gear 0.75 ·
Final drive 3.44, 9” Gear chart, G64/51 stock gears |
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G50 6 SPEED/993 BILLET SHIFT FORKS (all models) The original forks are cast and sometimes break or will
simply wear out. Billet forks are stronger, more reliable and are
commonly used in factory race transmissions.
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Non turbo
version
Turbo version
with ring gear thrust screw |
CMS G50 6 SPEED/993 BILLET SIDE COVER The original differential side cover is made of cast
aluminum. Under load there can be a
tremendous force applied to this cover, and it can break, sometimes resulting
in a damaged ring and pinion-or worse. Upgrading to a billet side plate will add strength
and increased reliability to the differential section. Our cover features an oil passageway for diff
bearing and accepts the standard taper bearing, radial seal and O-ring. The turbo version further incorporates a
thrust screw to reduce ring gear deflection under load. ·
993 billet side cover $425 ·
993 Turbo billet side cover $499
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CMS G50 6 SPEED/993 BILLET SIDE SHIFTER CONVERSION (all models) This patent pending design moves the main shift shaft
to the side of the transaxle case allowing for a neat and tidy way of
attaching shift cables. Perfect for
some mid-engine installations and especially where space is limited behind
the transmission. Shift cables can be attached or retrofitted to a variety
of shifters including the CMS billet cable shifter. ·
$999 (installed price) ·
$899 kit price (requires your gear housing and shift shaft) |
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CMS G50 6 SPEED/993 BILLET END CAP CONVERSION This conversion was originally designed for custom
mid-engine installations, and is useful when installation space is limited as
it will yield approx ˝ inch of additional clearance at the tail of the
gearbox. The end plate is available in two versions, with and without
the provision for the shift shaft. This also works well for some rear
engine applications. The conversion requires a different tail housing
to be used. $495
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ALBINS G50 6 SPEED/993 GEARS Stock gear ratios are designed for drivability and
fuel economy and not necessarily for best performance. Whether you have a stock motor or one that has been
tuned your transmissions’ gear ratios may not be optimum for your driving
needs. Optimizing your gears to match
your engines’ power curves can make a huge difference on the track, often
resulting in reduced lap times, and can give the sensation that there has
been a gain in power. Alternative gear
ratios can make the car more fun to drive or be more drivable. We carry a wide selection of OEM and Albins gears to
suit a variety of applications. ·
1st gear set (weld on type; requires
core OEM input shaft; requires additional labor-not included in price) $945 ·
2nd gear set $945 ·
3rd, 4th or 5th gear set $915 |
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ALBINS G50 6 SPEED/993 FINAL DRIVE/CROWN WHEEL AND
PINION The overall gearing in your transaxle can be reduced
or increased with alternative ratio final drive gears. We offer OEM replacement sets as well as Albins made
sets-and in ratios that the factory never produced. These high quality hypoid gear sets are
produced on the same cutting equipment and with the same design as OEM. Ratios currently available are: ·
3.10/10:31 (special ratio for V8 and
turbo applications – fits 2WD non turbo gearbox only) $2925 ·
3.44/9:31 (stock ratio, C2/C4/Turbo) $
inquire ·
4.00/8:32 (improved
street/autocross/track ratio – fits 2WD non turbo gearbox only) $2925 BREAK IN RECOMMENDATIONS |
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KAAZ G50 6 SPEED/993 LIMITED SLIP DIFFERENTIALS Help put your power to the ground more effectively
and add stability with a limited slip.
This is an improvement for a street car and a must for track car.
Rebuild parts and services are also available. $1695 |
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ALBINS G50 6 SPEED/993 BILLET AXLE FLANGES With big power and/or under extreme conditions the
output flanges on your transaxle can be a weak link. We have available Albins precision machined
case hardened EN36A billet axle flanges to offer for both standard size CV’s
or in the larger 934 size. These have
been a proven product in off road racing for many years. These flanges also promote more angular
irregularity than the standard flanges with deeper cups. $299 each |
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CMS G50 6 SPEED/993 MACHINE SHOP SERVICES ·
Shorten bell housing ·
Shorten main shaft ·
Shaft straightening ·
Bearing bore repair ·
Dog ring replacement ·
Inversion prep ·
Oiling system prep ·
Gear spot welding and honing ·
Cutting for DME provisions ·
Re-register bell housing ·
Surface grinding ·
Custom MIG and TIG welding |
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CMS G50 6 SPEED/993 T.O.B. (THROW OUT BEARING) BOSS
REPAIR It’s not uncommon for the bosses that capture the
pivot shaft for clutch release fork to crack or break off rendering your
clutch inoperable. We can
professionally repair your bell housing for a fraction of what it costs to
replace the housing or the transmission! $349 per boss (not
including teardown and reassembly labor) |
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CMS 993 1st or 2nd GEAR DOG
RING REPLACEMENT It’s possible to repair your Porsche 993 manual
transmission 1st or 2nd gears instead replacing them
potentially saving you big bucks. When
the teeth are damaged or worn out the transmission usually won’t stay in gear
and may also grind going into gear-further indicating possible synchronizer
wear and shift sleeve wear. The OEM teeth are welded to the gear and must be
machined off. The new teeth must be
fit and welded by an experienced technician.
We offer replacement both raw ready to install form or you can send
your gears to us to have the teeth replaced. Replacement synchro teeth $250
each Labor to R&R synchro teeth $250
each |
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ALBINS 993 SYNCHRO TEETH Sometimes termed as dog ring or synchro
hub, these are the teeth that the shift sleeve or “slider” engages
into. If you have a bad synchronizer ring and if you have been grinding
going into gear-you probably need to replace this part. Another symptom is that your transmission
won’t stay in gear. These are a direct replacement for both
OEM and Albins gears. ·
3rd/4th/5th/6th
dog ring $165 each Fits Porsche G50 6 speed transmissions
94-98 C2/C4/Turbo |
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ALBINS 993 BILLET SHIFT LEVER The original shift lever is cast and can in fact
fail. If yours is broken or tweaked-or
if you simply want to upgrade to one that will never fail, here you go. This one is built to last! $150 Fits Porsche 993 6 speed transmissions
95-98 C2/C4/Turbo |
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STEEL CAGE BEARING UPGRADE Beginning in late 1994 the factory used split type
plastic cage needle bearings for the idler gears. The shortcoming is obvious. Earlier generation G50’s used solid steel
needle cage bearings which have a more reliable cage with more robust
needles. $160 each |
